Dicor question.. I'm not sure, need help

SoundGuy wrote:

Old-Biscuit wrote:
Per Dicor (self-leveling & non-sag lap sealant)

Compatible with EPDM and TPO sheeting, it adheres firmly to aluminum, mortar, wood, vinyl, galvanized metal, fiberglass and concrete.

I've never used any 'primer'....just clean surface free of any old loose caulking

Unfortunately, not quite true. I'm surprised Old-Biscuit wouldn't know this but Dicor did a few years ago issue this warning about using their conventional lap sealants on the new generation of TPO roofing material that was beginning to show up on the market as the result of patent expiry on the original formulation. Complaints were being received that conventional Dicor, when used on this new generation of TPO, would bubble so to address that issue the company introduced a new 2 part system called Ultra Sealant and that's the product the OP is using. I'd suggest he contact Dicor for the correct answers to his query, not rely on ill informed WAGs here on the forum. :R

FWIW, our previous 2008 KZ Spree which we purchased in the spring of 2007 had a TPO roof and because it had the original version of TPO roof sheeting I used conventional Dicor self leveling lap sealant on it with great results, no issues at all. :B However, that was then and this is now so anyone who owns a trailer with TPO sheeting needs to know just which version is on their trailer and as such use the correct lap sealant designed for use with that particular version. Unfortunately the OP hasn't provided any info about his own trailer but from his description his dealer presumably identified it as the type of TPO requiring the use of Dicor's 2 part Ultra Sealant system.

I was surprised to find out I have a TPO roof. Never enter my mind that there was different types. I was picking up some "dicor" for sealing around new fantastic fan I was putting in kitchen. Went to my RV place and asked for a tube to seal vent and they asked what type of roof. I never knew and researched from there. I confirmed roof type with manufacture and prior to that I followed the chart on page 10 of Dicors info. If you follow the chart there is actually a TPO that has fleece backing. That contradicts several youtube vids that go by color or backing alone.http://www.dicorproducts.com/resources/guide/RudysRoofbook_16.pdf