Patent ID: 8906481

Claim:
A prepreg assembly having a surface and comprising: a) a surface enhancing layer located at the surface of said prepreg assembly, said surface enhancing layer comprising a veil of fibers, said veil of fibers having an areal weight of from 5 to 20 grams per square meter; b) at least one reinforcing fiber layer comprising a structural fiber sheet comprising a fibrous reinforcement and an uncured thermosetting resin matrix; c) a fleece layer located between said surface enhancing layer and said structural layer, said fleece layer comprising fibers wherein the fiber areal weight of said fleece layer is from 30 to 70 grams per square meter; f) an uppermost surface layer comprising a curable thermosetting surface resin and glass spheres having a mean particle size of from 5 to 50 micrometers, said uppermost surface layer being located on top of said surface enhancing layer and forming the surface of said prepreg assembly wherein, when the assembly is cured, the uppermost surface layer has a sandability of at least 0.30 mg/cycle over 200 cycles, as measured according to ASTM D4060 using a Taber 5151 Abrasion Tester fitted with H18 wheels and a 1.0 kg weight.