I use to wipe the block with acetone, then wipe with muritic acid and then a dulted baking soda water wipe to neutralize the acid followed by clean water. One more wipe with acetone.

Get the block very warm to the touch and lay on light layers of color. I had a old electric wall oven that I built a sheetrocked and R19 insulated paint oven that was 4 foot cubed inside for baking parts. Set it to 150F for 1/2 hour.

All these new paint formulas are crap without the lead and other dangerous chemicals.