Glad to see that you were able to get your tank clean. Be careful using acid on aluminum as it’s very corrosive. I do use it in a controlled manner for cleaning out the oxidation in cylinder head water jackets, and a few other applications.
The Por-15 is usually used on steel tanks with holes in them. Your two-piece cast aluminum tank might be the most rugged outboard tank ever made. If it develops a leak, the leak would likely be at the seam. The fix for a leaky seam is to disassemble the tank halves and reseal it.
Save the Por for a steel tank. Just an opinion. Good luck with the TD-20!
Improvise-Adapt-Overcome
