Are you talking about duratec high gloss additive?
http://www.fibreglast.com/product/du...-coat-additive I have never sprayed it but rolled my bilge with it and it still looks good after 4 years. Another good product that many of the pros use that might be better then the duratec...never used it either but might be worth checking out.
http://www.ferro.com/Our+Products/Sp...ch+booster.htm
strick