I only use Tech Line or Power House plug but there has been times I mix to fast, have bubbles in the cup, I just don't take the time, my fault. To solve the bubble problem I put the ball under a 40 watt light, let the light stay on for about 20-30 minutes. It heats up the material, air bubbles come to the top and 'pop' (?) anyway they are gone and I haven't had any problems since.
In mixing material, as the old saying goes....speed kills.
The light thing also helps in the winter time if your area gets a bit cold at night. I had my heater go out last winter ( our really only super cold night for us ) and the light helped it stay warm along with getting the air bubbles out.
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net