Model # 1675273

Internet #203163733

Store SKU #184360

Loctite PL S30 10 fl. oz. Black Polyurethane Roof and Flashing Sealant


PL S30 10 fl. oz. Black Polyurethane Roof and Flashing Sealant

  • Resists deterioration from weather, stress or movement
  • Flexible to expand and contract with construction materials
  • UV and ozone resistant and does not soften in the sun
$585 /each
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Frequently Bought Together

Product Overview

Loctite PL S30 Polyurethane Roof and Flashing Sealant is a premium quality, commercial grade sealant developed especially for forming permanent, water and weatherproof seals in all exterior gaps and joints. This sealant is elastic and remains flexible to expand and contract with construction material movement to protect and retain the original seal. It provides properties of non-sag, permanent flexibility and corrosion resistance. It exhibits outstanding durability and tear resistance. It usually requires no primer and resists deterioration from weather, stress or movement. It is UV and ozone resistant and does not soften in the sun.

Info & Guides

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Individual size (oz.)


Caulk Features
Moisture Resistant,Mold and Mildew Resistant,Paintable,Permanently Flexible
Caulk Form
Standard Tube
Caulk Type
Coverage (linear ft.)
Cure time (hours)
Dry color family
Dry to touch (min.)
Longevity (years)
Paint Product Type
Professional Paint Supplies & Values
Pro Supplies

Warranty / Certifications

Certifications and Listings
ASTM Compliant
Manufacturer Warranty

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Customer Questions & Answers

Use for covering flashing nails

Is this product suitable for covering nails going thru metal flashing? I'm scraping off the old dry caulking first. Also, the product "skins" within 24 hours. Not sure what this means? If products has had 24 hrs to "dry" before rain, is this suitable?
Asked by: Bodie
Hi Fred- Product should work well with only a few hours dry time before rain exposure. The curing reaction is activated by water vapor, so liquid water will not inhibit the cure (but it won't speed it up, either). Full strength will still take several days.
Answered by: Flxblflyr
Date published: 2015-11-09

Will this PL S30 Black Polyurethane Roof and Flashing Sealant stick glass to metal?

Asked by: Mark
Yes. Not sure if it is safe for aquariums, however.
Answered by: Flxblflyr
Date published: 2016-05-18

Can this be used on wood roofing joists and gaps?

Asked by: Nrt17
Henkel, you say on October 10, 2016 "It is also suitable for shingle tabbing and for covering roofing nails" but earlier I found this response from you: "August 31, 2015: In answer to your question, the Loctite PL S30 Polyurethane Roof & Flashing Sealant is not recommended for filling or sealing over nail holes." So, what is correct? Is it meant for covering roofing nails or not??
Answered by: b0bb0
Date published: 2017-06-18

Can this product be applied to EPDM roofing membrane without fear of damaging the rubber roof?

Asked by: Dgm63
The Loctite PL S30 is not recommended to be applied to EPDM roofing membrane, You will need a sealant that is specifically designed for EPDM roofing membrane.
Answered by: Henkel Corporation
Date published: 2016-07-27
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Customer Reviews

PL S30 10 fl. oz. Black Polyurethane Roof and Flashing Sealant is rated 4.6 out of 5 by 8.
Rated 5 out of 5 by from This is a great product for permanently sealing leaks...also paint sticks to it has extremely low... This is a great product for permanently sealing leaks...also paint sticks to it has extremely low shrinkage ..I use it to repair blown up shingles and cracks and to showcase it's durability some people use it to seal pond liners...
Date published: 2017-06-27
Rated 5 out of 5 by from I'm never without this stuff I have used this for years for construction projects, inventing, repair, and prototype fabrication. It is the sealant I always wanted silicone to be: tough, adhesive, rubbery, and gap filling. I always have a tube in the shop. I use it for structural adhesive as often as for sealant. As an adhesive, the initial grab is poor, so you have to keep things in place. I've also used it for automotive repairs, when I didn't need the high grab of a contact cement. Full disclosure- I haven't used this on construction projects very much, so I can't testify about longevity, sun resistance etc. But it's paintable, and it seems like it would do a great job. My cautions are really the flip side of what I like about it. This has lots of working time, and is easy to handle. For the first day, however, it remains sticky, and is pretty weak. Don't be fooled. The strength builds up over time- it becomes very strong, tenacious, and flexible. Curing is triggered by exposure to water vapor, so a slightly moist environment speeds it up some- but thick sections may take days to reach full strength. It sticks to everything, except waxy plastics like PE, PP. But- that stickiness and easy texture makes it easy to get on your to your clothes, shop bench etc.. Be thoughtful and work slowly. Nitrile gloves are a good idea- unless you like black, sticky fingers. I apply it to small projects with popsicle sticks or bamboo skewers, work over papers and try not to touch it. Some folks are sensitive to Urethane- it has never bothered me. It foams up slightly- maybe 10%, which is usually a great thing for filling in gaps, but can leave your brilliant caulk gun artistry a little bumpy. For sealing, it is just bulletproof. Cleanup with mineral spirits seems odd- it never worked at all for me. I found that 91% isopropyl (rubbing) alcohol seems to work much better, and can even be used for smoothing the surface of the uncured sealant. Clean up right away- otherwise no solvent works. Trim after it loses tackiness, but before it gets to full cure. Hint for re-using the tube after a small job: After the first job with a new tube, cut the tube tip off removing the pointy end altogether. Then let some sealant ooze out, maybe 3/8" past the end of the tube. That oozed sealant will cure into a tough and flexible handle. If you need more sealant later, pull the sealant handle slowly. You can usually get a plug of cured sealant out of the nozzle, even a few weeks later. That opens the tube for re-use. BTW, their PL urethane construction adhesive is also one of my favorites, a must-have, for rigid joints and good gap filling with odd material.
Date published: 2015-07-04
Rated 5 out of 5 by from This product is a game changer We have been doing roofing for over 20 years. We are GAF certified installers. Been using Karnak SBS Ultra and or Black Jack.. PL S30 is a product any roofer can stand behind. Long lasting product.
Date published: 2013-07-10
Rated 5 out of 5 by from Use it for everything. Been using this product for years here in Colorado and have just recommended it to some friends who live outside of Woodstock,VT. Not only do I use it for roofs but customs built showers to seal the HardieBacker seams, plumbing issues, calking the fins on new window installs, sealing cracks in foundations and so on. My elevation in Colorado is 7K' and the sun is pretty brutal on building materials. Unlike silicone you will not be able to rip this off only after a year and I never had it leak. Can't think of anything it doesn't stick to yet although I've wanted to try it on Tyvek. The only thing you need to be aware of is that it takes twenty-four hours to set up so it can be a little messy. Rather than try and smooth things out if I add too much I wait until it dries hard and then trim off the excess. If you use a battery calk gun watch your speed as I have blown apart the tubes from the pressure.
Date published: 2015-08-14
Rated 5 out of 5 by from Best Sealant I have ever used- easy to use and it sticks like crazy! Easy to use and it sticks like crazy! The 1st time I used it I goofed and didn't clean up right away- BIG MISTAKE! The 2nd time I read the directions and used mineral spirits and the sealant came off everything I had gotten it on (even clothing) without much effort! Of course, washing with a good hand soap is paramount afterwards.
Date published: 2015-05-13
Rated 2 out of 5 by from Don't use it over another sealant! I didn't get a chance to use this product after reading the Loctite website instructions from the manufacturer.I was planning to use on a crack that already had been chalked, tarred and/or sealed over the years. Loctite says: Not Recommended For Contact with oil-based caulking compounds, butyl caulking compounds and silicone sealants (uncured and cured). Surfaces must be structurally sound, dry, clean, free of dirt, moisture, loose particles, oil, grease, asphalt, tar, paint, wax, rust, waterproofing, curing and painting and compound. I would like to try this product but other than new installs, I don't see how it can be used over existing materials
Date published: 2015-08-04
Rated 5 out of 5 by from good sealant I will see how it holds up this winter! It was easy to apply!
Date published: 2015-01-01
Rated 5 out of 5 by from Awesome! I had a small leak around my kitchen skylight. During heavy rain I would get a few drops of water on the kitchen floor. I cleaned up the edge of the skylight on the roof and applied a nice thick bead. I smeared it in with a gloved hand. Worked great. If you have any cracks or nails or seams showing on your roof, get this stuff!
Date published: 2016-05-29
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