wrote:

Hello all,

I have some hollow plastic models that I'm trying to make much heavier,
and I figured some sort of casting resin would be ideal, although I
don't know much about it.

I figure a low viscosity resin could be poured through small holes into
the plastic forms, but I'd need one that hardens with a fair amount of
weight.

Any suggestions?

thanks much

Point to keep in mind, some resins give off heat when they are curing.
Be wary of any resin if it's instructions say it is "exothermic" while
curing.

Bill Shuey