Water tank protection?

[MEGAdetail]

Not sure plasti dip is durable enough.

What's your reason why you think that?

[CCC4me]

I think the clear would crack from the plastic flexing.

Or just use a flex agent and adhesion promoter in the paint like on urethane bumpers.

Why not just opti-lens it? Or the spar-urethane method?

[MEGAdetail]

Or just use a flex agent and adhesion promoter in the paint like on urethane bumpers.

Why not just opti-lens it? Or the spar-urethane method?

Isn't spar-urethane only for wood?

[CCC4me]

Isn't spar-urethane only for wood?

Originally, but this guy's been using it with good results on headlights: Headlight sealant: spar urethane vs. opti coat 2.0
Headlights will flex and expand due to movement and temperature changes, though maybe not as much as a water tank.

[Hazcat]

You could bolt metal/aluminum sides around the tank to obscure the view and paint the metal or polish the aluminum.