Detail Seams with Razor Blade

What happens here

After rough shaping with the rasp, use a razor blade to meticulously cut along the seams where the body filler meets other panels or gaps. This process should be done while the Bondo is still slightly pliable but firm. The razor blade creates a sharp, clean line, preventing unsightly hard edges that could lift or crack over time. This technique is especially important around hood lines, door jambs, and other panel gaps.

Goal: Create clean, defined lines along seams.