I have been looking at the POR 15 products and they have been recommended a few times.

I've seen a few machinery enamels that can be thinned by white spirit, and are much cheaper. Are these likely to be as hard wearing as the other enamels?

Also looking at PPG selemix 7-610, as I think I can get that locally, its a synthetic enamel so the thinner is pricey, but cant find out if it is oil resistant for the using flood coolant.