Joe,
The idea behind the 320 sand paper is that the "grit" separates the the paper itself from the wet ink and the grit dose not disturb the print.
Plain paper would wick up the ink and would create a light spot on your woodgrain.
A more coarse grit like 100 will work O.K. but if it happens to move or slide it is more likely to scuff your parts.
A very fine grit will let the paper make contact with the wet ink.
320 just seems to be the best grit for woodgraining.
That is what the "old timers" that I learned from used.
We have an inexpensive corner tool that helps with very tight corners like 90 degree ones found on many 20's cars.
Also here is a link to a video showing a little trick on how to get into the corners.
http://www.woodgraining.com/forum/viewtopic.php?f=11&t=40&sid=faccefc232d70d4dad303dc6ae7e00e9 Here is a link to a video on the finishing of the clear coat to show quality standards, with JDee going into the exact procedures and products we use in our shop.
http://www.youtube.com/user/JdeeRat#p/u/5/6sQmkP6utoQ Evan
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