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			Be sure to check that driver side frame rail and behind the brake booster for rust/etc. If your car ever had a brake fluid leak, that will eat right through factory paint and lead straight to rust. 
 
Are you just using a rattle can black? I'd recommend some type of rust-proofing paint on the bottom framerailes and trans tunnel (anywhere that will get hit with moisture a lot.
		 
		
		
		
		
		
		
		
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