or what i've done is cut it out and smooth it out with a dremel after it dries....I've also seen people staple the rim to keep it tight and cut it b4 the resin
There spray glued to the rings before I cut them.
2003 Pontiac Gran Prix GTP-Thrasher CAI, 180 degree t-stat, AL 104's, ZZP/PT Pcm, ZZP Stg 1 HV TB, ZZP headers, 3'' custom catback, magnaflow mufflers, 3.4''