You can get the stuff at Michaels (if you're in the States). I used it for a PT Boat dio some years back and it works well. Still planning on using it for my LCM3 dio someday. Here's a link to what you can achieve with this stuff.
Envirotex Lite is a two part epoxy. The key to using this stuff without melting the plastic is to pour in layers, about 2mm thick. Let it cure and then do another layer and so on. You can mix acrylic paint in the resin to get the color that you want.
"...any man who may be asked in this century what he did to make his life worth while, I think can respond with a good deal of pride and satisfaction: "I served in the United States Navy." John F. Kennedy, 1963