Can you advise me what shelf life I might expect for the GlassCast 50 ?

Hi bclarke, 

Stored correctly, the shelf life on all of the GLassCast Epoxies is 12 months; realistically and because we get through so much), you should have 12 months from the date of dispatch albeit generally, the resin side will last much longer than this , the hardener will degrade faster.