How do you coat a tank on the inside?
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You just pour the stuff in and swirl it around.
Obviously having the tank off the bike makes it way easier. Unless you?re just a beast of a man.
There are products available to coat/seal steel tanks. Plastic tanks typically only need careful cleaning.
Remove tank, mask/plug as product directs, pour in, rotate(by hand or chucked into lathe) to coat interior, pour off excess finish as directed.
Been many years since I have had to do one but had good luck with it back then.
Re: How
#1: Order phosphate coating
#2: If tank needs cleaning, use electrolysis (various guides online). Make a "cork" that fits your tank-port. There's some huge ones at hobby lobby around decorative bottles that can be modified easy. You need a DC power supply of some kind to do electrolysis.
#3: Follow directions on phosphate cleaning to a T, including cleaning stage(s).
#4: Do the final phosphate cleaning and drain the tank
#5: Let it sit as per directions
#6: Done
It's not a coating so much as a chemical reaction - kind of like certain metal products protect against rust by.... developing a thin film of corrosion. You're doing a thin phosphate corrosion in essence, and it keeps your tank rust free from there.
https://kreem.com/fueltankliner.html
They've been in business for who knows how long. I used their products back in the late 70's on a few H-D tanks, with good results.
This motorcycle business is adding up to some dollars. But it should be fun when done.