Patch, or Replace inner fenders?
FWIW, For a pair of inner fenders I bought two 5 buck HF double sided plug cutters (hole cutter). They do like to walk without a center in the weld to keep them in line. Night and day difference using cutting fluid as well. I went through both sides of one cutter and started on the second removing the two inner fenders. A quality cutter will cut your time/effort IMO.
FWIW, For a pair of inner fenders I bought two 5 buck HF double sided plug cutters (hole cutter). They do like to walk without a center in the weld to keep them in line. Night and day difference using cutting fluid as well. I went through both sides of one cutter and started on the second removing the two inner fenders. A quality cutter will cut your time/effort IMO.