It seems like you should have had extra paint if you mixed enough paint and thinner for 2 coats or is it what you mixed was enough for two coats?

Interesting question and a chance for food for thought. Just guessing from my own experiments: Your top coats were thinned more than they should have been by the hardener. The pigment/solids layer in each coat is thinner than it would be if the right mix ratio was used. Since it has dried and looks good, the extra hardener didn't cause any chemical rejection or eat into your undercoats, so the time window has passed for lift and wrinkling. The paint will stay stable like it is. Thinner paint may fade faster, less resistance to sun and weathering are the possible consequences.

A few times i have mixed paint for a brush on chip repair or bolt heads and put more hardener in place of thinner to finish a Qt. I don't use thinner for brush touch ups because they aren't being sprayed. Then of course noticed another place that needs to be sprayed. These were touchups over a scratch to prevent rust until it's time for full repaint. Rather than waste paint with a remix, i just switched to a bigger gun and sprayed. Which results in a thicker coat. That's a little differant than your mix, as it still had the correct solids. It leaves flash-off time--if any to guess work. I waited a half hour on recoat to be safe and this guess worked in 90 degree temps.

My theory is thinner is the vehicle that carrys the paint to the metal and allows it to pass thru the gun and lay down smoothly. Flash-off time is needed for thinner to escape as it is evaporating. If there were no thinner, flash-off time isn't needed but time to tack is needed to prevent one heavy coat. Any input on this chemistry experiment?

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