![]() ![]() ![]() The ideal repair uses fillers only as a final skim coating for minor imperfections, but I see cars with Bondo at the shop that's cracked and looks like it's been put on by someone trying to frost a cake. ![]() It's annoying and time consuming working with body fillers, the less they're needed the better as they expand and contract differently than the underlying sheet metal does, so larger portions will over time crack under the paint especially on darker colored cars. Bondo is very difficult to sand and cut down once it's fully cured, anything under 60 grit is pretty slow going and clogs up easily, but spot putty can be hand sanded with 100 grit, then you use a high build primer, sand that with 200-300, maybe 400 grit wet in steps, prime again, resand, then assuming you have no high or low spots you can apply base/color coat, sand, more base/color if needed, sand again to make sure it's all flat, then clear coat and cut/polish the clear if needed. Say you have a big dent or need to fill the gap around a patch panel, you'd use Bondo for the bulk of the filler work and then spot putty to feather the fine edges and fill in the little imperfections and sand the skim coat of spot putty with a higher grit that would be effective on Bondo. Bondo would be for thicker uses and spot putty is for small blemishes, like pinholes in the Bondo caused by sanding into air bubbles or sanding scratches in the bondo itself. ![]()
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