It is easier to use and better looking than the Walmart stuff.

This is a great product for use on RV roofs. Easy to use and very effective. I gave it a 4 due to the fact it arrived damage. The entire dispenser tip was broken away from the tube. I was still able to use it, but it was a little messy. I am sure this was an isolated incident and I will definitely not hesitate to order again.

Despite the inaccurate words used in the product title, Dicor 551LSB *Non-Sag* - *Non-Self-Leveling* sealant is the only black colored non-sag sealant that's compatible with EPDM, TPO and PVC roof membranes, at least as far as my research could find.

I needed to replace a plastic gutter spout that is fastened behind the gutter/rail that holds the roof membrane in place as it turns over the horizontal edge onto the vertical wall. I needed:

-non-sag, as it is applied to a vertical surface
-black color, to match the existing gutter & spout & existing butyl tape & sealant
-compatible with PVC roof membrane, aluminum gutter rail, fiberglass wall

I contacted 4 of the major manufacturers of RV sealants--Dicor, Geocel (ProFlex), Sika and LaSalle Bristol. All 4 responded, but only Dicor's product is compatible with PVC along with EPDM & TPO.

The sealant is a bit fussy to work with. It skins over very quickly; you've got maybe 2 minutes to work with the surface before it begins to skin over, and I was working in a cool, shady area. However, once it skins over the sealant takes 2 days to really begin to feel solid. The Dicor product data shows the following for cure times:

-5 Minutes "“ Skins over (I'd say that's very generous!)
-4 Hours "“ Waterproof
-48 Hours "“ Cure 80%
-30 Days "“ 100% Cure

It has a very flat appearance once cured--matte, not glossy--and it has a very slight tendency to sag on vertical surfaces, nothing really objectionable and it helps to reduce high spots without having to tool the surface.

Worked great to put fan in the roof of the van.

I used this to seal a leak in a shed roof where I attached the Solar Panel mounting frame. When I installed the panels, I used asphalt cement around the bolts which didn't work. I had drips around two of the bolts. With the panels installed it was hard to apply the asphalt around the two bolts that were leaking.

With the Dicor 501LSB-1 Self-Leveling sealant, it was able get it around th bolts, and it settled around the bolts as it dried. Its raining hard today and the roof isn't leaking anymore