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I've been looking for discussions on repairing sand-throughs in the forum without any luck. I'm especially interested in repairing a sand-through that happens as one is final sanding the finish before buffing. Specifically, this sand-through is occurring when using an epoxy pore filler (Silvertip) and a clear, slightly amber topcoat (EnduroVar). The only thing I know right now is to sand everything off and start all over. If anyone has an alternate method I would sure like to know.
Thanks

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Formerly know as Mandodiddle.

Have you tried applying SilverTip or Endurovar to the sand through area yet to see if the color matches up with the surrounding color?

I haven't sanded through both Endurovar and SilverTip yet so I can't say for sure what would work as a simple repair. Maybe somebody here has had the opportunity to make that kind of repair and can give a method that worked.

I can say that I've fixed sand throughs of just SilverTip by diluting SilverTip 50:50 with denatured alcohol and wiping it on the sand through one time with a paper towel (lint free). If the sand through is small, a Q-tip can be used to apply the diluted SilverTip. When the alcohol evaporates, it leaves a very thin epoxy film over the sand through that matches the color of the surrounding area and makes the sand through invisible.

One thing I tried that didn't work was to go ahead and apply Endurovar over a small sand through in Silvertip on a mahogany neck. The sand through spot stayed a slightly lighter color than the surrounding area.

Maybe you could apply diluted SilverTip to the sand through and then build up coats of Endurovar over that and then level sand and polish. If it works, it would be a lot easier than sanding everything off and starting over. The question then would be how well the Endurovar melts into the Endurovar that's already there and whether there would be witness lines or not. Hopefully, someone else here can address that. That's something I would like to know for when I have to repair Endurovar at some point.

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Once in a while you get shown the light in the strangest of places if you look at it right - Robert Hunter

I have not used Silver tip, I use West system so take it for what it is worth....
If you apply a couple of thinned coats of epoxy to the sand through area, as Jay mentioned, and then lightly sand to remove any epoxy that has overlapped the Endurovar, you can then build some coats of finish on the sand through area. Then lightly sand the entire surface (top, or back ,or side ) that has the "sand through" and reapply enough finish to level sand without cutting through the new finish.
Assuming it is new work and the wood hasn't developed a patina it should blend together reasonably well .