Question About Shapeways "Goose" Peterbilt Parts

[scottyk]

I got a Mack cab and hood from them, was told the nylon material was not friendly to sanding and would just ball up on you. Use high build primer first then sand that down till its smooth. I know the parts I got would not fill well even using automotive paint, real auto clear coat MIGHT be thick enough to give it a smooth look but I dont know.