No, not a criticism, that is exactly what I did. I did not prep them perfectly, and that is why I did not say any more.
For just a quick try with minimal prep, it does a decent job on the few scraps I had laying around.
I expect it will do a great job once I have time to play with it, and take more care in the prep.

I'll give it a real try sometime this week and report back.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-