You've encountered crystalization. Like others suggested, warm up the resin and the crystals will melt/disolve. The only problem is these crystals often screw up the pump so it might start "burping". Make sure you pump into a calibrated cup so you can catch any uncalibrated measurements before you screw up your ratio.

> Hey All,

> I could use some advice here. Last night I finally settled in to do some
> finishing work on the CLC I built last year. I had everything sanded and
> ready to epoxy when I could not get much out of my resin pump. I took it
> out and the plunger part was half full of this white pasty stuff. The
> resin in the bottle seems OK.

> Now I received the epoxy(MAS) about a year ago, and last used it in
> August. I am guessing it is dried out resin in the pump. Is there a way
> that I can clean this out, or should I chuck the pumps in the garbage and
> get some measuring cups for the work I have left? Does anyone know how to
> contact MAS?

> Thanks for the help, CHad