More for aesthetics. I have heard the same about aluminum and heat but also that it depends on what the temp gets up to.
Aluminum car wheels get powder coated all the time, and that's on a vehicle were the force on the aluminum is constantly changing with road conditions and vehicle weight. I was think since the tank is stationary and its weight would never shift or change once its up.
Thought I would put some feelers out on R2R to see if anybody had done their stands.