Steve DP 90 is a good product, if that is what was used. I'm sure what cprice is refering to is to sand it in preperation for recoating, this will allow the new top coat to adhere to the existing primer. If possible find out the brand and product line that was used. Then recoat or paint with a product from the same line. This will ensure proper product compatability. But I'm sure that after 2 years all is well. Good luck with your project
Al
