Hi I have painted two engines with por -15 products .
IF you you use their por 15 engine enamel it will come out great .
I caution using spray paint over the por-15 because it may peal off because por-15 has only a small window to top coat the por needs to be tacky to almost dry . This means it has to be top coated in 4-5 hours to get the best adhesion . you can look all this stuff up on the por 15 web site technical info . hope this helps . p.s. get the clear coat from por if you use their engine enamel or it will discolor if you ever spill anti freeze or fuel on the intake . cj