Model # TH.041805-20

Internet #204814320

Store SKU #1000037543

Thompson's WaterSeal 5 gal. Clear Waterproofing Wood Protector

Thompson's WaterSeal

5 gal. Clear Waterproofing Wood Protector

  • Provides optimal outdoor wood protection
  • Perfect for protecting decks, fences and outdoor furniture
  • Special formula stays put to prevent water damage
$6298 /each
store icon Loading Buying Options...
package icon Loading Buying Options...
Sorry, but we ran into issues loading these options. Please try refreshing.

Frequently Bought Together

Product Overview

Thompson's WaterSeal Waterproofing Wood Protector Clear provides complete outdoor wood protection. It waterproofs long after the initial water beading is gone. Use on decks and fences, outdoor furniture, exterior wood.

California residents: see   Proposition 65 information

  • Use on decks and fences, outdoor furniture, exterior wood
  • Covers 1,500 sq. ft.
  • Crystal clear finish
  • Coating resists mildew and UV damage
  • Helps maintain wood's natural color
  • Prevents water damage
  • Exceeds industry standard ASTM D-4446 for waterproofing wood
  • Cleans up with mineral spirits
  • Online price includes PaintCare fee in the following states: CA, CO, CT, ME, MN, OR, RI, VT

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.



Container Size
5 GA-Gallon
Coverage Area (sq. ft.)


Application Method
Brush,Paint Sprayer,Roller
Coating Product Category
Color Family
Dry to the touch (hours)
Number of coats recommended
Paint/Stain Base Material
Paint/Stain Clean Up
Mineral Spirits
Paint/Stain Key Features
Dries Clear,Mildew Resistant,UV/Fade Resistant
Paint/Stain/Waterproofer Product Type
Deck, House & Concrete
Substrate/Surface Use Type
Time before recoating (hours)

Warranty / Certifications

Manufacturer Warranty
Satisfaction Guaranteed

More Products With These Features


Customer Questions & Answers

can you spray on with a sprayer

Asked by: john
No! The new milky white water based product works OK in the sprayer but will go on too thick and stay sticky for weeks.
Answered by: OldTimer
Date published: 2017-08-10

Will this work on a painted deck?

Will this work on a painted deck?
Asked by: Doc
Yes, insteed.
Answered by: Character
Date published: 2017-06-17

can it beused on pressure treated wood

can it beused on pressure treated wood
Asked by: 69nova
Yes. Pressure treated wood can still dry out over time. I recommend applying it every 6 months. Unless you're in a climate that dries it out quicker. Then you may want to do it every 4 months. A simple squirt gun test can help determine if it's ready. Squirt a small area and if it soaks in and darkens the wood instead of beading up you're ready to reapply.
Answered by: Don
Date published: 2017-07-22

How long can a partially used container be stored? Will the unused product lose it's effectiveness?

Asked by: MaryD
Just Keep It From Freezeing It Will Last Till Next Season
Answered by: Boonie
Date published: 2017-05-09
  • y_2017, m_8, d_14, h_10CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_40
  • loc_, sid_204814320, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 95ms

Customer Reviews

5 gal. Clear Waterproofing Wood Protector is rated 4.2 out of 5 by 114.
Rated 5 out of 5 by from Pump-Sprayer Issue Resolved - Thicker formula DOES spray! This is a detailed review which contains information on the project, preparation, difficulties encountered and a resolution. To bypass the lengthy review please scroll to view the summery. After studying feedback and comparing prices, Thompson's Wood Sealer appeared to be the best bang for the buck. Negative reviews were read concerning Thompson's thicker formula and its inability to be sprayed via pump sprayer. However; it was decided to give the product a try based on the good-to-bad review ratio. The project: Sealing 250 lineal feet of a 6' high shadow box fence. 1500 square feet total. For preparation, Berh All-In-One Wood Cleaner #63 was used the weekend prior. The directions were followed on the back. It took (5) 1 gallon jugs of cleaner and 8 hours of pressure washing. This made the wood look new. The fence dried beyond the 48 hours recommended by Thompson's. Doing so ensured the fence did not contain moisture. The initial sealing test: To start, (1) five gallon bucket was purchased from The Home Depot. Additionally, a Flo•Master 885-021 2 gallon pump sprayer was obtained. The gentleman at the paint desk machine-shook the bucket since the pour outlet did not support traditional stir-sticks. The first usage took place around 6:00PM on Thursday September 22, 2016. The temperature was about 77 degrees Fahrenheit. The product sprayed smoothly; no uneven build-up or runs. Excess material unnoticeably made its way to the bottom of the pickets and dripped off effortlessly. NOTE: Additional passes were needed for complete coverage because of the "fuzz" formed on the wood. The fuzz was created by pressure washing. The fence would have consumed less product and the application would have gone faster had an electric orbital sander been used on the pickets prior to sealing. A couple passes up and down with 120 grit sandpaper would have done the trick. It probably would have taken about 2 hours to sand the face of the pickets. After 35-40 minutes of filling, pumping and spraying, 5 gallons of sealer had been used. (6) 8' sections of fence were sealed and completed. That's 288 square foot of coverage. As mentioned above, more area would have been covered had the pickets been sanded. With coverage expectations in mind, (5) more 5 gallon buckets of sealer were purchased Saturday evening after work. These five cans were machine-shaken as well. The cans were stacked on the porch Saturday night to be used Sunday morning. Work began the next morning at 9:00am. The temperature was 62 degrees Fahrenheit, which was also the night-low. Filling the sprayer container, the sealer was thicker and poured more slowly than the bucket from the days earlier. When Spraying began, a huge problem was immediately encountered; uneven coverage, inconstancy, building-up and thickening. The product had to be evened out with a paint brush. Even after inconveniently brushing, the fence section still looked gooey. Thinking back on the negative reviews, the cans were searched for a production date; the batch number was located. The first can was 200xxx and the other cans were 130xxx-160xxx. A different Home Depot was contacted (store #4115) since all but 1 can were purchased from the first store. Unfortunately, all their stock was the lower batch number as well. The woman's name who gave assistance over the phone was Yvonne. She was extremely helpful, patient and determined to find a solution. It was agreed that contacting Thompson's on Monday was the best way to get accurate information on the batch numbers. Strapped for time and lack of work-days-off, another solution had to be found. "How can this stuff be thinned without ruining it"? The directions clearly state "do not thin". Then an epiphany!! The main ingredient is mineral oil. Oil gets thicker when cooled and thinner when heated. The directions mention the workable temperature is 50 degrees Fahrenheit and higher. That morning it was about 62 and rising. The cans were placed under the sun for about 2 hours. This brought the temperature above 70 degrees. The result was remarkable. The product once again flowed like water. The thick and gooey clear transformed into the beautiful workable product from days earlier. The fence was finished 3 hours following the increase in product temperature. There were 2 gallons leftover upon completion. The end result was beautiful, glowing natural-looking wood. This was very pleasing. So the issue is not with the mixture but with the operational temperature. The other folks who experienced a problem over the last few years most likely would have benefited from an increased temperature as well. The next day Thompson's was contacted and the findings were reported. The woman from Thompson's mentioned there was a formula alteration in 2013 which thickened the product. This was due to a change-in-requirements of the Environmental Protection Agency. She also mentioned there shouldn't be a significant difference in consistency between the different batch numbers. The negative reviews were brought to her attention as well. It was suggested to her the usage temperature be increased to 70 degrees Fahrenheit. Furthermore, the directions should state: if being applied with a pump sprayer, do not store container in an area where the temperature may decrease below 70 degrees. She mentioned she would immediately forward the information to the marketing department to address the concern. After speaking with Thompson's, Yvonne from The Home Depot was contacted. She was very happy to learn of the fix. Yvonne said she would educate her staff about the findings which would ultimately benefit the consumer. She represented her employer with utmost professionalism and sincerity; qualities not always found in today's corporate workforce. She is an asset to The Home Depot. Summery: *The product is excellent. It looks great and maintains a darker but natural wet look. *The price is wonderful compared to other marketed competitors. *The application is very easy when applied with a pump-sprayer. **If using a pump sprayer, be sure to store the can(s) in a room where the temperature remains above 70 degrees Fahrenheit or let the cans sit in the sun for 1-2 hours to increase the temperature. (Fall was 2 hours, the summer season may only need an hour). *If applying after pressure washing be sure to sand off the "fur" created by pressure washing. 120 grit sand paper with an electric orbital sander should work great. Otherwise, more product will be required to cover the desired area. Finally, enjoy! This product has just enhanced all your hard work.
Date published: 2016-09-30
Rated 3 out of 5 by from Thompsons Water Seal is ok. However after all these years... Thompsons Water Seal is ok. However after all these years of using it I have found out that is doesn't last like it used to.
Date published: 2017-05-23
Rated 5 out of 5 by from Seemed to do the job. There seems to be a love it or hate it situation with wood protectors. I pu... Seemed to do the job. There seems to be a love it or hate it situation with wood protectors. I put this on new pine fencing. Read good tips for using a sprayer, the best being to make sure it is as warm as possible to help thin it out. It did happen to be 100 degree the day my wife and I rolled it on but we ended up just using a 3 foot diameter kiddie pool and sliding it along as we went. Worked well give the volume of product you are dealing with verses filling a painters tray about every 2 minutes. This worked well but plan on getting some on you. If you use a fluffy "rough surface" roller it is going to fling it around pretty good when you are loading it up with the product. Comes right off with soap and water as far as I can tell. Visually the fence looks great. Really darkened the pine and brought out the details. Will see how it looks after a season but honestly with EPA regulations I don't think there is anything better to be found.
Date published: 2017-05-23
Rated 5 out of 5 by from This Is A Good Product, Last A long Time Under Heavy Traffic On Decks This Is A Good Product, Last A long Time Under Heavy Traffic On Decks
Date published: 2017-05-09
Rated 4 out of 5 by from It seems like the majority of negative reviews about this product cite that it cannot be effectiv... It seems like the majority of negative reviews about this product cite that it cannot be effectively applied using a sprayer. The solution is definitely thicker than older Thompson products, which were almost like water. However, it can be sprayed on surfaces using a pump sprayer under the right conditions. It helps if the temperature is 70+ degrees, as this makes the solution less viscous. Keeping a high pressure on your tank keeps things flowing nicely as well. I used a Flo-master 1.5 gallon bleach pump sprayer and was able to get a decent fan of liquid moving. The only issue I have is that the quoted coverage can be overstated. The side of the can states that it covers 200-400 square feet per gallon. The description online quotes 1,500 square feet for the 5-gallon can, which is an average of 300 square feet per gallon. If you have new wood with a very smooth finish, I can see achieving this, but my experience required much more product. My fence has been up for about 8 years and was stained and treated previously. It had aged to a weathered grey look. I pressure washed it and removed debris, but did not sand it. This left the wood a bit porous. To cover my 2,472 square feet of fence, I ended up using 37 gallons of product. This equates to 66 square feet of coverage per gallon or 334 square feet per 5-gallon can. So take that into consideration. The solution in one of the cans I got seemed to have separated. When applied to the wood, it did not absorb the same way and left shiny flakes on the surface. It seemed like the product had sat in the can too long or perhaps was not sealed correctly during production. Whatever the issue, I had to exchange that batch for another can. I experienced no further issues with the other cans I purchased. I am happy with the end result of using this product. It added a great layer of water protection to my fence and created a darker/wet look that shows the grain a lot more. I have used this product on my deck in the past and it holds up pretty well.
Date published: 2017-04-11
Rated 5 out of 5 by from We bought a new house which came with a new fence and in order to protect the fence and maintain... We bought a new house which came with a new fence and in order to protect the fence and maintain the color of the wood we bought Thompson's WaterSeal. The WaterSeal was easy to apply. We got one of those spray bottles which you are able to pump air into and apply the the WaterSeal. Our fence was a decent size and so we used about 2 of the 5 gal cans. The fence is currently maintaining it's original color and the wood will be protected and keep longer than if not treated. Definitely looks better that the neighbors. So far so good and I happy about my purchase. Home Depot associate was very knowledgeable and helped explain how to apply the WaterSeal and everything.
Date published: 2017-06-27
Rated 1 out of 5 by from This milky white water based product is awful. It left my deck blotchy with white stripes and whi... This milky white water based product is awful. It left my deck blotchy with white stripes and white blotches. It is still tacky a week after application. I sprayed it on and the results are unacceptable. My can had a sticky label advising not to apply too thick. If you must use this poor product apply by hand and really thin. This stuff sits on top of the wood and does not penetrate dry wood like the previous product. I will not use again.
Date published: 2017-08-09
Rated 5 out of 5 by from New look from old decking Just pressure washed decking that had probably not been treated in at least seven years. Amazed that it came out looking really great. Waited two weekends & then applied the Thompson's Water Seal. It has rained since then & the boards are beading up. I think that part of deck was built in 1993, so I am impressed with the final results. Have used this product over the years & always happy with the results.
Date published: 2017-06-20
  • y_2017, m_8, d_13, h_22
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_114
  • loc_, sid_204814320, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 123ms