Duplicolor primer/filler. Never had a problem. On the other hand krylon and rustoleum have been pure garbage. I apply a couple of mist coats, then a couple medium coats, then a wet coat or two, allowing it to flash between each coat.
These putzes pushing electric as being green are so clueless. It takes the burning of fossil fuels to make your stupid batteries and to generate the electricity to charge them. Nuclear and solar power is simply not enough.