I've roughed out a foam plug for some new bodywork working off cad drawings. I've used celotex type low density insulation and i'm now looking to start coating and filling. I was considering covering the foam plug in a fibreglass skin and then building up the finish in layers of polyester primer filler. Can you recommend a suitable cloth and a whether I can use a polyester resin or ?. I have made the plug approx. 3mm smaller than the finished item to allow for a finished build up. ( I attach a photo pre sanding to give an idea of curvatures. Thanks

i've used a cad model and sliced it into sections. Im not using cnc just finishing by hand. Really looking for the simplest and tightest way to form a hard skin on the foam so that i can build my finish on. I had heard about mixing micro balloons with resin and painting it on rather than using matting but not sure if this would form a hard enough skin to work off? Thanks