mapep said:
What is the basic difference between resin and styrene? Which would be better for buildings? Which would be better for railroad rolling stock. I realize styrene has been around a while, but I know very little about resin and its uses.
Resin has been around a long time too. As far as I know, resin requires a catalyst or excellerator to harden and it gets very hard. Some resins can harden when exposed to air, but this takes days. The hardening process is not reversible. Styrene moldings are made by softening pellets and forcing it into the mold. It hardens with temperature and can be returned to a liquid state by adding heat.
Which is better for what depends on whether you have a mold to make your parts or you are going to fabricate them from sheets, strips and other forms. I was missing a stone wall from a styrene kit, and just to see if I could do it, I made a rubber mold from a different wall and used epoxy resin to cast a new wall. I cut and filed it to fit and when painted, you can't tell the difference.
Well, I can because the mold I made was not as sharp as the original, but at N scale, no one else will notice.