Primer, glazing putty, Bondo or whatever you use, if you can see ANY imperfections before the color goes on it will look like CRAP. It needs to be way more better than that if you want good results. You can use rattle can primer to test the surface, shoot a little bit on and see if you can see the waves and wrinkles through it, or if you can see the edges of the bondoed area. If you can see them, it will be very obvious once it is painted. Really if you just close your eyes and feel the tank, the imperfections will be apparent. Little microhoony bubbles in the bondo will show up badly too, as the color will be deeper in each bubble, and when the paint dries it sinks back into the hole, you can't miss it, that's a bubble.
Time spent being a perfectionist now will save you a lot of aggravation later.
Time spent being a perfectionist now will save you a lot of aggravation later.
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