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@M_V
Not sure what the effects of blasting are on steel but on alu it leaves a horrible pitted surface.
I guess this might give the rust a head start on steel, or it may just help it get into the fabric of the metal and be more damaging.
I always nitromors frames and treat them like a non stick pan if im going to leave it bare or just lacquer it ie no abrasives.
I'm pretty sure that in america they just strip the paint n leave the metal to it's own devices and just keep the bike/hotrod in the garage on the 2 days of the year that it rains.
Bit of a different story when we have to ride around on an inch of grit salt on the roads.