Quoted: What about using a fine sand paper? I would assume it gives similar finish than sand blasting. Further, I'd assume the technique used does not play the main part but the result. Any experiences?
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Personally I'd recommend sticking with blasting. The last thing you want is that coating not to stick in a spot and ruin all your hard work. You could probably get away with sanding but the lightest I'd go is 320 to 400 grit. And you will need to be able to sand in every little nook & cranny to get the same effect as blasting. Most automotive repair shops & auto body shops will have a blast cabinet, you will probably need to take in the alum oxide media though.
The condition and how you prep an item for refinishing is one of the most important parts of the project. This is the foundation for the coating to be applied over. Most of the finish problems (flaking, pealing, & easily rubbed off) I see are in someway associated with a short cut or skipping a step during this part.
Its your stuff and you can do what you want to it. But I would seriously encourage anyone interested in completing a do it yourself refinish reading stickmans how to thread or getting the DVD from Lauer. And please follow the instructions of the coating manufacturer. They know the best way to apply their product.
Joe