Turned a couple of acrylic pens, and sanded and had a smooth finish on it. applied ca to the pen, small amounts of medium ca with very low rpm, applied several coats in same manner, spraying hardener after each coat. Wet sanded, finish looks o.k. but seems to be small bubbles in finish under the top layers, can sand out. Not sure if the bubbles are due to temp in shop being cold or the use of the spray. I turned a few awhile back, warmer outside, but didn't use the spray. Any idea where my issue might be? thanks...I followed the guidelines now as well as in the past with Barry Gross Acrylic dvd, didn't have issue until now, and it is in both pens tonight. thanks again. Dennis