On Friday, February 20, 2015 at 12:33:49 AM UTC+13, Bruce Hoult wrote:
On Thursday, February 19, 2015 at 11:47:28 PM UTC+13, wrote:
On Wednesday, February 18, 2015 at 9:18:19 PM UTC-5, Jonathan St. Cloud wrote:
Last two trailers I got the fiberglass and had a local craftsman insulate the interior.

What did you use for the insulation?

Styrofoam sheets are probably the only reasonable answer. If you want to make it more durable you can brush or roll or spray on a layer of epoxy resin or urethane. NOT polyester resin. And some thin glass mat if you want to be super fancy.

Movie and stage show people make a lot of scenery and props out of foam, and then need a hard coating on them to protect them.

This seems to be one of the ones they use:

http://www.fxsupply.com/materials/foamcoat.html

Coverage seems to be about 150 sq ft per gal, so you might need about three gallons or $160 worth to do sides and top of a trailer. Here in Wellington, the same area of recycled polystyrene sheets will cost about twice that.