| abstract |
The invention provides a radiation curable gel coat composition for fibers reinforced substrates, comprising a gel coat resin and at least one diluent monomer (B), wherein the gel coat resin comprises urethane (meth)acrylate reaction products (A) of a reaction mixture comprising: (a) a hydroxy-terminated polyol having a weight average molecular weight of about 200 to about 4000, this polyol being a polycaprolactone polyol or a [(poly)carbonate-(poly)caprolactone]polyol; (b) a diisocyanate; and (c) a hydroxyalkyl (meth)acrylate, and wherein both the diluent monomer (B) and the reaction product (A) contain polymerizable ethylenic unsaturated groups, preferably (meth)acrylate groups. Such gel coat composition provides adequate surface appearance and maintain color and high gloss when exposed to outdoor circumstances. |