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is there any hull prep that can be done that allows copper coat to be applied to an aluminium hull on a sail boat? I have been told by local boat yards that copper coat on an Aluminium hull is ok PROVIDED that at least 4 coats of epoxy barrier coat are applied after sand blasting. Reading through th...

Hello, new here.  Been reading through the forums gaining much info. However I cant seem to find a clear answer to which media for sand blasting is considered best or at least better then most medias that are available. Any info or pointers to the info on which is the better media for sand blasting ...