Nothing I'm aware of that I would be willing to try. The 3m flexible parts repair works excellent and sands easily. As far as epoxy primers I'm sure there are some others out there that would work but again the spi gives excellent results. The key to a lasting repair is to be sure and repair all the cracks and not to apply the epoxy or paints to heavily.
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1969 GTO street strip project 11.1 forged 461, highport heads
1995 Trans-am 420 ci sb 14:1 compression 9"ford
9.89@132 1.34 60ft SOLD!
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