I think that even $350 is insane for just a tank. I've gotten my VW GTI front bumper (custom), rear valance and side-skirts painted for less than $200. Local kid did them and the job was immaculate.
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I agree that it is expensive but paint prodcuts are expensive. You have to buy: sandpaper (several different grits), blocks, primer, paint and clear. Oh yeah don't forget that you need activator and hardener for the primer, paint and clear. Oh yeah don't forget that they each take a different activator and hardener. That is a lot of cans or product. Then you need at least two buffing compounds.
The only way to get a "deal" on this is if someone already has all the products and you are only paying for "portions" of it. It can be done, you just need to find a shop that has it on the shelf. Maybe they just painted something similar to what you want.