New answers tagged paintjob
Since OP said the bike was Aluminum, we should note some things: Painting aluminum almost always goes wrong when done at home. Upon sanding, often sand particles are embedded in the aluminum (sand blasting likely doesn't help). Chemicals are the way to go for stripping aluminum frames. You need a different type of primer (etching primers specifically ...
Commercial paint jobs often use heat-baked enamel, with multiple coats (not just undercoat and topcoat), and finished with a clear top coat. The baking process produces a really tough, well bonded coating, and the clear topcoat (as well as being tough) produces a nice finish that hides scratches.
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