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Wait, I just read that again... I thought it was a major no no to put spray paint on styro... am I remembering that all wrong, or does this plan not spray the styro, but the plexi? Hmmm... maybe that warning was for packing peanuts... darnit that's just gonna drive me nuts.

DS's science fair project was a solar (doghouse?) heater... Dozen aluminum cans -spraypainted black- Wooden Frame Vent -hot air out- CPU Fan -other end to blow cold air through cans- Well anywho, you can find tons of plans online... we found one and then tweaked it down to 12 cans. Worked...