POR15 will be your best bet for sealing down any rust that you don't want to completely remove...however I always advocate just cutting it out. If you go with POR follow their directions and you'll be fine.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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