Hi all hope you can help, iv come across a problem that I need help wit, on a couple of occasions when painting cas resin, the paint doesn't dry and becomes sticky, even after sanding back and reprinting it some sort back, iv had one also where the resin has gone soft and iv had to dig it out and rebuild, thinking I'd not mixed he resin properly, however Iv noticed it on a a couple of slush casts also, I would have thought even if I hadn't mixed it enough before pouring when slushing it round it would continue to mix it, the paint I use are general halfords spray paints, I have even tried plastic primer instead of the standard stuff, Any ideas ?Ta in advance