DYMET

... aluminum fuel tank ...

... has dents and crack ...

Spraying without crack fixation is a mistake.

The coating is dense but rather brittle.

The tank bottom plate deformation causes the crack in the coating. The moving crack must be fixed.

This time thick aluminum plate was used to fix the crack.

It is tightly bound to the bottom by screws.

The sealing up is quite reliable if there is no deformation of the coating.

One may spray coating of 1 - 2 cm thickness to make it strong, but it is a wrong way.
The practice of holes sealing up by DYMET with cover plates is well examined. The plate may be fixed

by welding,

by screws

or by rivets. *AS*