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rust
i prefer sand blasting and it can be done DIY
how ever there are dangers of silicocis and secondly you may warp something with a build up of heati like to leave it to the pros . Why dont you rough it up with a sanding disk a little higher up and put a new cut through
the clean area with the angle grinder then you will have a nice preped area to weld to ive got a seventy five horse truck
its sitting there waiting its turn itneeds cab corners gaurds &bonnet (hood)
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