Fiberglass removal from steel

[Alex Blair (RIP)]

Originally Posted by Joe Lorenzino

When I used to be in glass working, we used a product named "Attack" to remove cured two-part glues and resins. Most of the time it was to remove glued on brackets, mounts etc. The stuff works by breaking the cross-linking action of the catylist within the cured resin. It had to soak for quite a while, but it did make things come appart. We used to buy it in small (6oz.) cans from a jewellery supply store, but I am sure it would be available in larger sizes.
The other way we used was to "bake" things in the kiln for a while. That might not be a good plan for your tank, but maybe putting the steam cleaner wand in it, and leaving it there until the tank is as hot as possible, would help lossen the fiberglass.

When we started building fiberglass boats for the navy back in '62 we had a similar product..
It is still available..
Attack Epoxy and Polyester Resin Glue Dissolving Compound


Dissolves cured epoxy and polyester resins so you can quickly and easily separate misaligned materials or clean cured resins from metal, stone, glass, wood and many other materials.
8 fluid oz. 38.325 Buy $13.40

½ Gallon
GLU-250.50 Buy $45.95

https://www.ishor.com/adhesive.php