Originally Posted by Piersg
Interesting and timely thread as I'm about to move on to working on the roof.
Is there an added benefit to spending the money and going with a 100% Silicone roof covering like Henry's Tropi Cool versus a standard elastomeric coating? I noticed the Tropi cool comes with a lifetime warranty versus a 10yr for the elastomeric stuff, but there is quite a bit of difference in price.
Silicone Roof Coating - Henry Company
I just got off the phone with a Henry's rep. I was asking about the difference between 287, 587, 687. When he asked what it was for and I told him (bus), he said that the 287 was not the product to use because it was latex based and would result in a powdery residue coming off the application. While this may be fine for a roof, this would be a mess on a vehicle (his words).
He recommended using 887HS TROPI-COOL
While it's more expensive, the 887 is a sillicon based product and should not require the primer base layer that the 287 does (287 might not actually require primer in all cases but im not sure about that). Also, the 887 goes further with 1-2 gallons/100sq-ft vs. 2-3 gallons/100sq-ft of the 287. Also the 887 looks to be longer lasting.
That being said I'm considering the 887 since it looks to be close in price when adding in all considerations. Have folks who used 287 noticed the powdery residue he was talking about. Was it a problem?