Re: New Segmented Bowl #1 Pic 1
Mark Kauder. Phenix City, AL
>Thanks Mike.
I sand lacquered bowls inside and out to 400 grit.
Step One: I do the inside, generally while the bowl is still on the lathe. I coat the inside with a coat of lacquer thinned about 30% lacquer, 70% thinner. I let it set for 10 minutes, and then wipe it off with a lacquer thinner soaked rag. I do this twice. The reason that I do this, is so that it is protected. But as I spray the outside, especially the neck, the inside will get lots of overspray on it. When I am done with the outside, I can (very carefully) wipe the inside again with the thinner rag to remove the overspray, without worrying about trying to sand it.
The remaining steps are all done after the bowl has been parted off the waste block and the bottom sanded and signed.
Step Two - The Outside: Wipe the outside with the thinned lacquer mixture, let it set, and then wipe it clean with the thinner rag. This cleans the outside, and works as a primer.
Step Three - Spray the outside with 3 heavy or 5 medium coats of lacquer - 10-20 minutes between coats. Runs in the lacquer are OK, but generally require more time to dry through. Allow to dry 48 hours.
Step Four - Wet sand with water. Grit depends on the wood. Closed grain wood generally is much smoother under the lacquer and I start with 400-600 grit. Open grained woods like Walnut, generally require more sanding to get smooth, so I may start with 220-320 Grit. Sand with the sandpaper in the flat of your hand - with overlapping circles.
Repeat steps 3 and 4 over and over and over until you have a perfectly smooth surface. If you sand down to the wood at any point, put an extra couple of coats on these points. Sanding - going to higher in grit after each application of lacquer coats. 400-600-800-1000-1200-1500 While sanding, wipe off the bowl every once and a while and inspect under a glancing bright light, to look for shiny spots (low spots).
If after wet sanding with, say 400 grit you have a really smooth finish after applying the laquer - go ahead and jump to 800. If smooth after 800 - go ahead and jump to 1200. Lacquer is different than sanding wood - new coats of lacquer fill in the sanding scratches.
After 1200 grit, if you have enough thickness of lacquer on the bowl, go ahead and sand with the 1500 w/o applying more lacquer.
After 1500, you can rub the bowl out with automotive "swirl remover". I use 3M
Finesse-it II.
However, lately after 1500, I have gone ahead and applied a couple of very thin coats of lacquer, and then sanded with MicroMesh 4000, 6000, 8000 and 12000 then rubbed out with the Finesse-it II.
I no longer apply any way over the finish. The wax tends to show fingerprints, and eventually clouds up (at least a little).
Once finished, I generally let the bowl set for 2-3 weeks, and then inspect it again. Lacquer continues to out-gas and "Thin out" (Russ says for 2 years). Sometimes after that 2-3 weeks, I will find a small defect has made itself appearent, and requires more sanding and lacquer. That is the case with this bowl, a small line appeared on one of the glue joints.
It is really not as much works as it sounds. I generally spray early in the morning on a weekend before working in the shop and stiring up dust (or before starting any work in the evening on a weekday). After the lacquer has set up a little, I bring the bowl in the house for the next couple of days. I generally do the sanding while watching TV shows at night, and it generally only takes about 1/2 an hour to sand with any given grit on a bowl this size.
So, it takes many days, but not much actual work time.
Hope this helps.
Mark