Liquid Rubber EPDM and TPO Primer – High-Performance Basecoat for RV, Camper and Trailer Roof Protection, 1 Quart

Works as described by other reviews. I will second the reviews that it is VERY sticky. Meaning you can get stuck and fall off of the roof.

This stuff is makes everything stick. It's amazing. I used it to seam a new EPDM KOI pond using seam tape. This stuff works crazy good. I am going to use it to seam my RV Skylight next.

After prepping my roof (scraping, rotory 3m disc, and lacquer thinner) removing the old sealant off the trailer roof, I applied the primer with a brush to the perimeter seam. This is a 6×12 trailer, I applied a 6" wide swath, then it tacked up slightly, so I applied a second coat to cover any deficiencies I may have left. Still have a half quart left. Material is very thin and easy to apply. The following day I laid down the seam tape, immediately followed by the top coat. Second coat of top added also a day or two later.

This product is very tacky even after 3 days of dry time. My shoes were literally stuck to the roof when I went up to put the rubber roofing on. Very hard to navigate the roof trying walk on this product. Did not like this step of the process.

This is working great so far on my 36ft fifth wheel that had a few leaks it's been several months and no leaks.

Went on easy, but it is already peeling up. Very disappointed. I do not know if it is from this or the lap sealant of the same brand but I have a horrendous leak now that has caused tremendous damage.

We purchased our first RV it's a 1999 Tioga. The roof was completely black. It had never been done. I followed the instructions and both the primer and top coat worked exactly as described. Yes, the primer will be tacky, yes, if you touch it, step on it or disturb it. It's very sticky. That's its job. We did 3 coats of primer and 3 coats of top. We are a 29' class C and still had almost a full gallon of each left. We used rollers just plain cheep ones. We did use brushes along the edge. We were in Colorado with low humidity and mid 50 nights and mid 80 days. It took a total of 4 days. I'm sure you could do it faster but this worked for us. Make sure to wait until it's at least 50 to start. Other than that. This was a fantastic product. We has had no issues with leaks. Those that left bad reviews obviously just can't follow directions. If you can you will 💯 be happy.

This was not as sticky as other reviewers suggested. After curing for 3 days we applied the rubber top coat and worked great.

Works well

I'm currently working on my old 1993 Sierra 5th wheel and seriously doubt the roof has been taken care of over the past 10+ yrs. Was considering not buying this primer and only buying the rubber sealant, since the roof did have a rubber sheet that was covering it. However, on closer inspection, I found that it was cracked in several locations and needed extra care and sealing so, I decided not to be cheap and bought this primer. Did test a spot on the roof with only the rubber sealant paint and found out that the rubber paint, covers better/thicker when I used this Liquid Rubber EPDM Roofing Primer first. A word of CAUTION... Do NOT paint the whole roof of your trailer with the primer and then think you can walk on the roof and paint the rubber sealant paint. This stuff IS sticky and stays sticky and your feet will get stuck. Not that you can't remove your feet but, you are fairly high up in the air and getting a foot stuck can result in you tripping and heavens forbid, falling off the side of the roof. Paint the primer in sections where you know you can reach with a roller attached to a broom handle or other. Then go back and paint another section with the primer, overlapping a bit of the previously painted primer. Paint the rubber sealant paint over that when it's dry/tacky and so forth. Once you've got a whole coat of the rubber sealant paint on your roof, you can walk on it when it's dry and paint the rest of the coats you will need to make sure your roof is waterproof. I also re-caulked, primed and painted around all the vents, prior to dealing with the whole roof. I'm very pleased with the result!!

I bought this for my camper renovation. With a few help from online tutorials, install went without hiccup. I have also bought the brand’s paint and application was manageable. Will review it’s durability after some time. Great product!

This stuff is extremely sticky, worked well

En fait, ce primer est plus comme une sous-couche de colle. Assurez-vous de l’étendre à l’avant de vous et de reculer tout le long. Assez adhérant que ma semelle de chaussure y est restée quand j’ai mis le pied dessus par erreur en voulant compléter un bout derrière moi avant de descendre du toit de la roulotte. Avec le primer et "liquid ruber", mon toit de roulotte est ultra étanche et sûr.