Ian
Notorious member
Usually it's just the white stuff that gets dried out and densely filled with little hard specks that won't mix in. When that happens (often, even recently purchased Acra-Glas kits have this problem), simply loosen the lid and nuke it in five second bursts in the microwave (25 seconds total for the small container was plenty for me). The white stuff can now be stirred up with a popsicle stick and quickly becomes homogenous and fluid like thick paint, and doesn't get much thicker when it cools down. The amber part rarely gets too dried out to use and doesn't tend to form little hard specks, so no need to heat it but I tried it and it does help if you want the final mixture to flow a little.
Don't try to heat the stuff AFTER it is mixed, that just makes it set up before you can even get back to the shop. In case you didn't know, heat will bring the initial cure from 24 hours down to one if you put a 60-watt bulb in a reflector a few inches from the glassed area.
Don't try to heat the stuff AFTER it is mixed, that just makes it set up before you can even get back to the shop. In case you didn't know, heat will bring the initial cure from 24 hours down to one if you put a 60-watt bulb in a reflector a few inches from the glassed area.