I saw a post the other night implying that fibreglass resin reacts badly with styrene. Is there anyone who has experience of this? (I was thinking of glassing the inside of my vacformed styrene helmet.)
Eventually, the resin could attack and break-down the styrene, but most likely, the resin will be cured before that would happen. Once the resin is cured, it becomes stable. The reason resin attacks polystyrene is because the solvent in resin is styrene-monomer. I hope this helps clear things up better for you.
I used epoxy fiberglass to strengthen my styrene backplate.It worked like a charm,and it's rock solid.I had no problems with the heat warping the styrene,or any reaction from the epoxy.Hope this helps.
I'll try and source some casting resin and use it to stiffen the joins and the inside of the cheeks. I was wondering what brand of casting resin you recommended so I can look out for some here down under. Phil