Was your tank originally polished? I’m no help to you there.
I find the best indicator if a tank was polished is found under what remains of an
original decal. However you often don’t have any remaining decal. Then looking
at the welded seams, how well were they polished and is there any noticeable
difference between the seam and the rest of the tank. I also look at the underside
of the tank. Its usually the best persevered as to how smooth the surface was
originally.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.