Rated 4.6 out of 5 by 47
Rated 5.0 out of 5.0 by woodlandone Lessons learned
Considering the problems this product solved for me, the price (thru HD) was excellent.
Now to the lessons learned.
1) When you clean your house, you may have invisible mold spores or roots still in the wood/substrate. Clearly I did as I bleached, SCRUBBED, and rinsed the previously sealed cedar siding on my front porch - which is on the NW side/front of the house. I had previously used an alkyd primer and solid-stain (rubbol) on this same cedar siding. Then I minimally touched up using Ben Moore's alkyd primer, following up with 2 coats of Sikkens rubbol solid-hide stain (which I love). This was early June, 2016. About 10 day later, I saw mold growing. When I cleaned the surface, I realized the mold was UNDERNEATH the recently applied rubbol finish. (Looks and feels like silky paint.) It was actually growing underneath and creating darker areas everywhere the siding was below the top-most plane of the surface!
2.) Freaking out, I started researching online and spoke to my paint supplier. This stuff got great reviews from my trusted supplier so I ordered it from HD. Then I brought the cans to my supplier for tinting (HD's price beat my contractor's price but comes in white.)
3.) Early July 2016, I left the original porch covered area alone and continued cleaning the other sides of the house, adding the additional step of the Mold Killing Primer (MKP) before touch-up caulking and reapplying the rubbol finish. In the meantime, the original surface was growing mold again in less than a week. Then I finished the NW side which is not covered by the porch and two separate NE sides of the house. Then I bleached the front porch again - still seeing the darker/grayer areas in the deeper planes of the siding. (Note that the trim, the floor, and the ceiling did not have this same problem as they did not have the texture that the cedar siding did.)
Fine, so now I've bleached the area under the 38'w x 8'd x 10'h NW-facing front porch 3X. Mold is still visible beneath the recently applied Sikkens Rubbol Finish.
4.) Then I focus on the rear of the house where I had previously only applied the alkyd primer a few years ago. This time I bleached and pressure-washed the siding, then followed up with the MKP. All seemed great.
Then the rains came. I couldn't re-coat the primer due to the monsoon and 8" of rain in 3 days in Central VA. In only 6 days, mold was regrowing on this SE, under-the-rear-porch area of the house. Crestfallen at the reappearance of mold, I realized I was able to wipe off the new mold. So, it was only on the surface of the recently applied MKP.
Fine, so got out the bleach sprayer, reapplied solution, and then began to rinse with just a hose, not pressure wash. SHOCK - the primer started to PEEL OFF!
Again, calls to my supplier. Turns out, I hadn't waited long enough for the wood to dry out from all the moisture - in the wood, in the primer, in the environment. I left everything alone and persisted in the areas that hadn't gotten wet from the rain. And I waited about 5 more days to re-coat the siding with the MKP and then the Sikkens finish. (I also added a mold inhibitor to each of the gallons of the Sikkens Rubbol finish, especially since it is a alkyd/latex blend and mold LOVES oil-based materials.) Several days after I completed all of that, I tested to see if any of the product was peeling or even able to be scraped off ----NOPE, all adhesion is great!
5.) Now, early October, 2016 - no mold has regrown on any boards that I first covered with the MKP before reapplying the final finish. But it's growing just fine on the front porch siding. So, I moved back to the front porch to finally addressed the subsurface mold. Again, very obvious black mold spores covering about 25% of the surfaces of the siding growing thru from I guess roots left behind from June 2016.
So it was 10/11/16, the fourth time I've applied cleaning solution to the siding and the third time I've pressure-washed. The next day - I used my recently purchased moisture meter and got a reading of 2%, knowing that the boards were dry from the pressure-wash. (They would be because they were already plenty sealed, just with mold encapsulated.)
6.) 10/12/16 I liberally applied the MKP to all siding under the porch. It visually concealed the mold more when it was wet but I could sort of see the darker greyish color underneath as it dried. I let it dry overnight.
Checking this morning. I can't see mold underneath. It's 10 a.m. and 58 degrees outside. The moisture meter is reading 21% on the recently primed siding. And the can states that the material can be re-coated within 30 minutes and re-coated with any finish. Once the humidity gets a bit higher outside, I will apply the first coat of the rubbol finish.
TO SUMMARIZE LESSONS LEARNED
* Always pressure wash siding after cleaning to ensure that mold spores that are killed or invisible due to bleach are detached from the substrate. Scrubbing textured surfaces does not ensure removal of all unwanted material.
* When reapplying paint, stains, or sealants, seriously consider reapplying some sort of treatment that clears away mold roots and/or mold spores. These items are available in primers, spray treatments, or additives to paints. (Had I done this on the first area refinished, I would have saved the time & material cost of three more cleanings and two coats of finish on the 38' x 10' front porch wall.)
* Invest the approximate $50 in a moisture meter to let you know when boards are dry enough to apply solutions according to manufacturer instructions.
* Allow the stated amount of time for sealants to dry before adding additional treatments.
a.) Had I waited more than one day for the rear porch cedar siding to dry out from the initial clean and pressure wash, the MKP would have had enough time to dry and may not have supported mold on it's surface to begin with.
b.) Had I not applied more solution to remove the surface mold on that siding on the rear, the primer wouldn't have peeled off where it did. Where I left it alone to dry, it adhered and I was successfully able to reapply more MKP and 2 coats of finish.
All is well today, 2 weeks later on the rear porch.
This week, with low humidity, I will complete the front siding, adding the Sikkens Rubbol and reinstalling my beautiful front porch furniture. Then I can sit back with a cup of coffee, and RELAX into Fall, 2016.
October 13, 2016
Rated 1.0 out of 5.0 by Joshua I have to write a dissenting opinion. This is latex, not absorbed by drywall, and for me it came off as I was painting!!
Number one this product is overpriced. There is no way it is worth more than $20 a gallon. True, it did block the water stain and signs of mold, however as you can see it was not absorbed into the drywall. (Note: the primer had been on the ceiling for at least 2 weeks before I started painting.) I used regular ceiling paint with a little bit of added texture to cover any imperfections in the ceiling. Admittedly, it was a bit thicker and heavier than regular paint. As I was about to finish, I noticed a small air pocket where the paint and primer had come loose from the ceiling, as I went up on the ladder that small area got bigger and bigger until finally about 20 square feet had come loose from the ceiling, about the exact area that I used the Zinnser mold killing primer as opposed to my regular Behr primer. Horribly flawed product, and now I have to start over. What more can I say about it?
June 23, 2016
Rated 5.0 out of 5.0 by Rhondo Zinsser Mold Killing Primer
Zinsser Mold Killing Primer did it's job well and had a pleasant smell as well. It covered the spots on the wall completely.
October 11, 2016
Rated 5.0 out of 5.0 by Barry This stuff covers well
I have two spare rooms that I plan to renovate but I’m not ready to start yet so I’m trying this product out on a scrap piece of wood for now.
When I received this there was some paint around the rim by the lid which I thought was a little strange coming straight from the factory.
This is quite thick so it puts on a good layer with just one coat, see pictures. It also does not need to have a topcoat on it. It can be recoated in an hour which is pretty good.
Because this kills mold and mildew it has pesticide safety warnings on it as well as the normal paint safety warnings so you should take notice and be careful with it.
I don’t know how effective it is against mold because I would have to judge that over time and see if any mold comes back. I’m assuming it does the job it says it does. If I see any mold on it later I’ll re-review it.
June 6, 2016
Rated 4.0 out of 5.0 by KEKE paint
I LIKE IT THAT IT DIDNT HAVE A STRONG ODOR TO IT, EASY TO CLEAN UP, WHY DO I HAVE TO WRITE A LONGER TEXT?
October 4, 2016
Rated 5.0 out of 5.0 by jim no more smell
After doing all the other recommended things, the final touch to prevent the outside wall was protected. We then put new insulation followed a new dry wall. Under the sink mold is not one to meds with.
September 10, 2016
Rated 5.0 out of 5.0 by Vinco Excellent product
Well worth the investment. Excellent surface coverage, no need for a second coat even where there had been traces of mildew.
clear instructions and labeling for application and self protection and clean up.
September 7, 2016
Rated 5.0 out of 5.0 by KB630 Doesn't smell too bad!
Having survived painting a bathroom with oil based Kilz to kill mildew, I didn't want to do it again! This was SO much easier! No overwhelming fumes, easy water clean-up (cleaned up so well that I was even able to re-use the roller!), and it went onto the walls easily.
I was most interested in the mold killing aspect, and I presume it will continue to work - so far (1 month) no mildew has returned. But it also works very nicely as a primer (duh!). Nice and thick, covering even the ugly brown that was on the wall, so I could paint 1 coat of a pale yellow!
It does have an odor - must be the mold killer - but it isn't too bad, and it dissipates by the next day (with the window open). NOTHING like Kilz oil base!
August 2, 2016