ernandez R -> RE: wet sanding (Jul. 5 2023 0:31:19)
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Hay Brother, good to see you are still at it! I use Naphtha. But like Rob I dry sand only early in the game. For the top I use only a vary well worn 320g. Back and sides a well worn 220g. I spit coat with a folded Cotten pad wet with no oil as many passes as I can get in a day then let dry overnight. I sand fairly aggressively in the morning. 4-5 days and don’t even think about polishing with the Munaca with oil until I’ve got things well sealed and leveled accordingly. Always seems I get a few pits in the rosette and bindings which I drop fill medium CA with a toothpick. I totally ruined my last WRC top when I accidentally used the ultra thin CA around the bonding, you’ve been warned :/ The top: Once I’m into polishing mode with oil and wool filled Cotten covered manuca I pad throughout the day then in the following morning I pre clean scrupulously with Naptha then I sand with a small block about 4cm long and 2cm wide, long edges rounded but short edges square. Two layers of paper towel as a pad between the block and paper. Clean, clean, clean! I’ll start with well worn 400g w&d, then 600g a day or two into it, then 1200g. A lot of zen here as to how or when. Seems oil is too thick for 600g or finer. I like to use worn/used paper as I find they don’t have any rogue grit that causes a deep scratch. Clean is the name of the game, I’ve buggered a couple tops when I let some crud get in the mix. I only ever sand perfectly with the grain. I drop the Naptha on the sandpaper. I keep a clean folded section of paper towel to wipe the sandpaper clean fairly often. After about two passes I’ll clean the whole surface with a damp Naptha paper towel. Then go at it again. Took me longer to write this then to do it ;) Get your game on doing the back first. I Like to do the back, get my grove on, then the ribs and neck and I save the top for last. I take notes and got a simple checklist for drops of fluid, manuca passes, paper grits, shop temp and humidity. First time with Naptha or oil or water( screw water, asking for trouble) make a test panel and use it first! And remember: only ever sand, wipe, and clean with the grain HR ps. Last three guitars I shellacked the top without the fretboard, oh man what a breeze and no more janky polish right there at the fretboard/rosette/upper bought. Pali who posts here from Spain does it that way, I gave it a try and… ¡olé! pps. I use these common black short nap floor mats in the shop to line the work benches, fibers are only about 4-5mm high, I found that they are perfect for cleaning the shellac dust out of the sand paper fibers as I’m dry sanding one or two passes with the paper then a few quick wipes on the rug and ready for another pass on the wood.
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