Lacquer and MM sanding

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penodr

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I have a question on how to properly sand for a final coat of laquer. I have been sanding the wood to 12000 MM then brushing on the lacquer, with sanding in between coats, with no problems. The question I have is on how to sand the final coat. I tried sanding with MM and started getting black lines. Im guessing that the lathe was to fast. So, should I be hand sanding? Sanding with the lathe on slowest speed? What would you recommend?

Dave
 
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Try a lighter touch.
I sand laquer with MM on the 4th pulley on the jet mini after an hour.
How thick are you applying the lacquer?
 
I keep a paper towel moistened with DNA at my side, rubbing down the blank between grits. It cools the blank and removes any grit/dust. Haven't had a black line since I started this practice. Good luck!
 
You wipe between grits with DNA while sanding after applying the lacquer finish? Doesn't the DNA react with the lacquer and cause it to soften and smear around? What kind of lacquer are you using?
Originally posted by Jamie
<br />I keep a paper towel moistened with DNA at my side, rubbing down the blank between grits. It cools the blank and removes any grit/dust. Haven't had a black line since I started this practice. Good luck!
Click to expand...
 
Originally posted by Jamie
<br />I keep a paper towel moistened with DNA at my side, rubbing down the blank between grits. It cools the blank and removes any grit/dust. Haven't had a black line since I started this practice. Good luck!
Click to expand...
Just a warning note. DNA can soften partially cured lacquer (DAMHIKT). But this process can also help to smooth or blend it. The only problem is getting consistent results.[;)]
 
As others have mentioned, try wet sanding at the lowest speed with a lighter touch. fwiw, I use mineral spirits when I wet sand with lacquer.

Also, how long are you letting the lacquer cure before you rub it out? While some may disagree, I usually wait 4-5 days to be sure that the lacquer has fully cured.

jeff
 
Well it looks like I have made a few rookie mistakes.

1. Must let lacquer dry for a week not 2 days.
2. Turn the lathe speed down when sanding a finish.
3. Use a light touch.

So, back to try again. Thanks for all the good advice and I will let you know how the next finish turns out. Maybe even get some good pictures to show.

Dave
 
When I'm sanding a finish, I don't sand with the lathe running at all until I get to the highest 3-4 grits of micro-mesh. The higher grits are basically polishing and not removing hardly any material, and I like to speed up the lathe at that point so I can see the shine materialize.

With the lower grits...as long as you've removed any ridges and brush marks (along with the scratches from the previous grits) there's no need to sand any farther, so I don't like to risk sanding through the finish to bare wood, so lathe off for me...Just my personal preference. Also...with the lathe off, I can see much more clearly as to exactly when those ridges are gone.

Whether I'm doing CA or Lacquer, since I started sanding with the lathe off, I've never had problems. When I sanded with the lathe running, I often sanded through, especially with CA.
 
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