whats best ? I have searched, por -15 been around longest and best known but would like more opinions.

 

I have used pur15 not the others, it works well. spray or brush turns out pretty good. it is a little thick i recommend thinning it a bit. the base is enamel thinner so don't buy the pur15 thinner. other than that treat it like hard core paint you can abuse.

 

I haven't used the others but I actually am in the process of finishing up a set of new Stubbs sliders with the POR15. I guess I can't give you my opinion about its ability to last since I just put it on, but as far as application goes, POR 15 is really good stuff. I ordered 2 "starter kits" from POR's website, one of which is supposed to be enough to cover 6 square feet. I figured 2 starter kits would be good but man that stuff goes a really long way! The cans that come with the starter kit are TINY but I was able to double coat my sliders and have an entire tiny can left. I put mine on with a brush and it dried rock hard. You just have to make sure you follow their instructions to the T and prep your metal correctly and that stuff sets up bulletproof! One caveat: if the metal you're painting is going to be in sunlight all the time, i.e. lots of UV rays, then you've got to top coat the POR15 with several coats of some other paint to keep it from reacting with the UVs and fading. According to the website, the UVs will only effect it cosmetically and not chemically, so if it's hidden, then no prob. I am in the process of layering just plain old Rustoleum semi-gloss shaker can black on top of the POR15 and it's going down just fine. I put 2 coats of auto primer over the POR15 and then the black enamel and have no complaints about the job to speak of. If you have questions, like I did, the POR15 website was really prompt about answering any questions that I sent to them. Good luck!