View Single Post
Old 8th February 2021, 16:52
rossnzwpi rossnzwpi is offline
Senior Member
Join Date: Mar 2008
Posts: 220
rossnzwpi is on a distinguished road
Robert Q. Riley describes using polyurethane foam - which has a very fine grain and is not melted by standard polyester fibreglass resin. Polyurethane foam used to be readily available in insulation supply companies - I'm not sure if it still is.
Polystyrene foam is much more coarse and doesn't cut or sand in the same way. You can use a different, more expensive fibreglass resin (epoxy) to avoid melting polystyrene.
Reply With Quote