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Old 06-13-2013, 05:38 PM
69 widetrack 69 widetrack is offline
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I guess Brian this is what I'm getting at...I maintain that by sanding a surface, you are in fact opening it up and allowing the chemicals to enter the surface and giving you your chemical adhesion...The sanding gives you the mechanical or Physical adhesion.

I did a test many years ago...I took a panel that had been cleared, 1/3 I left alone..the center 1/3 I sanded with 400 grit, the other 1/3 I sanded with 2000 grit...I then applied 2 coats of clear over the panel.

The part of the panel that hadn't been sanded, the clear came off with a razor blade...The areas of the panel that had been sanded with 400 grit and 2000 grit it was difficult to tell which area had better adhesion, why, because the panel was opened up by sanding and both types of adhesion where present.