hey I'm using rattle cans......It's my sons mini chopper...It's my first....guide coat???? No primer...The patches disappeared after 3 good coats,since i was working with rattlers really 9 coats i like to keep them thin and I wet sanded with 600 between each coat, 4 coats of clear and sand, masked it off flamed it with a contrasting red, misted with gold...stripped the tape, and smoothed the edges, then put 12 thin coats of clear....I'm working on rotten shoestrings here so cut me some slack about the rattlers.....My son's gonna love it and It's saved me tons of money...I just graduated in February and there's not much in the sugar jar yet... I'll post some photo's of the project tomorrow.....I've got to box it all up tomorrow for safe keeping...Then I'm going to start the framework ......bending, cutting and welding...
Ripp[/QUOTE If you prime the tank in a light grey, use a dark color (I use black) to dust a thin "Guide" Coat of paint over the primer so when you block sand it, the places that are still dark are low spots. You want to use a block of wood or foam to "block" sand with to keep your fingers from making ridges in the filler, and to show you where you need to add filler. High build or filler primer can also help fill small imperfections. Duplicolor sells a Sealer primer which also helps keep the filler work from ghosting or showing through. Fill, guide coat, block sand, Repeat till you leave no black, then sealer primer,sand and paint. It takes a little more time, and money, but you end up with a better job, and happier customer.