You must prime all bare metal! The implement paint actually adhered better to the rusty areas vs the few bare areas that i didn’t get with primer. Make sure the temps are not to cold or to hot. Park the trailer in a shaded area or else the paint will blister. The more thinner you use the more bubbles you may get. You can knock bubbles down with brush. To avoid air bubbles use less paint thiner. Mineral spirits might work better for this reason.

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