I'm considering coating my fuel tank and have some questions. Who makes the best coating kit ? And what are the pros & cons of coating the tank ? Tank was modified by RYCA and then again to remove the unsightly speedo hole. It's going to look so much better. Thanks for any advice.

I've used the 2 part epoxy version with okay results.  I say okay because on aluminum they suggest you do an etch with something caustic.  Even though I rinsed as prescribed the caustic lodged in the pinholes and bubbled up through the pinholes months after finishing when the tank sat in the sun.  I don't think steel needs the etching so you should not experience what I did.

I've heard the redkote version eventually delaminates and causes troubles down the road.  If you go epoxy just don't cheap out like I did and buy a kit that's too small.

For the epoxy version the pros would be that any pinhole leaks are sealed.  Cons would be that any future mods that require welding are complicated by the need cut open and remove the lining in the weld areas and then reseal.

I used Redkote on an old Honda tank and it did the job but I eventually let the same bike sit with fuel in it for 2 or 3 years and I noticed that the fuel had taken on a red tint when I drained it.  It seemed like some of the Redkote had been dissolved into it but there is still an adequate coating in there and it was simple and easy to apply.  Will I use it again on another project, I'm still debating that.

I have used Kreem and Eastwood sealers - but the POR15 epoxy is my current favorite.

You need to use it with a warm tank and warm garage, as the sealer gets really thick in colder temperatures and is hard to get sloshed around the tank when it is like molasses.