while we're on it, someone might discsuss stearated vs. non-stearated. Not to hijack, just to piggyback
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| Author: | bob J [ Sat Dec 17, 2005 12:35 am ] |
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There was a discussion of sandpaper and more than one person stated they did not use aluminum oxide because it left some of itself behind on the wood. Could someone please explain this? If not aluminum oxide, what? Thanks guys, |
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| Author: | Terry Stowell [ Sat Dec 17, 2005 12:57 am ] |
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while we're on it, someone might discsuss stearated vs. non-stearated. Not to hijack, just to piggyback
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| Author: | Robbie O'Brien [ Sat Dec 17, 2005 2:59 am ] |
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not to highjack either but a quick reminder of the American and European grading systems might be in order. I mention this in my finishing DVD. If the paper is P grade paper than it is coarser than the American grading system. The numbers could be the same i.e. 1000 grit in the P grading system is actually around 500 grit in the American system. If you mix the two systems you could end up putting scratches back into the surface instead of removing them. |
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| Author: | Terry Stowell [ Sat Dec 17, 2005 4:10 am ] |
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aha. Just ran into that I think. I'll check for the "P". 3M (I think) 8oo grit automotive was coarser or least more agressive than some 600 I had around. Annoying. And now back to Bob's original question. Is it a stearate residue? only affecting water based finished? Help Us Please! |
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| Author: | Mattia Valente [ Sat Dec 17, 2005 5:22 am ] |
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P-grit stuff is coarser, but it's got a more even grain size than CAMI grade stuff, IIRC. |
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| Author: | mrpbody44 [ Sat Dec 17, 2005 5:41 am ] |
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Do not use stearated sandpaper on your guitars it leaves behind deposites that will give fish eyes to any stain or finish you apply later. Sand paper is one thing I do not skimp on. Do not buy the junk in the hardware store. The 3M you get at Lowes is a lot different than the industrial grades you can get at Fastenal and other industrial supply companies. For basic sanding in 80,120,220,300 grits I use Klingspor products. For finish sanding in the 400,600,800,1000 and 2000 grits I use the 3M sanding films that you can get from LMI and Stuart Mac. For sanding belts and Drums I get the good Klingspor products as well. It is consistant from sheet to sheet and you end up using less of it so it saves money in the long run. |
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| Author: | Terry Stowell [ Sat Dec 17, 2005 7:38 am ] |
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[QUOTE=mrpbody44] The 3M you get at Lowes is a lot different than the industrial grades you can get at Fastenal and other industrial supply companies.[/QUOTE] Do you mean within the 3M line? Does 3M have an industrial line? I use micromesh for 1,500 and up I agree about not skimping! Klingspor has a good rep too. Consistent scratch is critical! |
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| Author: | Tim McKnight [ Sun Dec 18, 2005 12:13 pm ] |
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[QUOTE=mrpbody44] Do not use stearated sandpaper on your guitars it leaves behind deposites that will give fish eyes to any stain or finish you apply later. /QUOTE] That's odd because I use Grizzly sterated papers (220 & 320) between coats (of Nitro & Catalyzed Urethane) and I have never had any fish eye problems (except Bubinga which is another nightmare story). Sterates can cause problems on waterbornes but a quick wipe down with Naptha and a clean cloth will remove the sterates. Never a problem on KTM9 or Target 9000 either after wiping with Naptha. |
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| Author: | Howard Klepper [ Sun Dec 18, 2005 5:59 pm ] |
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Stearates are not a problem for shellac or nitro lacquer (the only finishes I use). In fact, stearates are what is added to lacquer based sanding sealer to make it sand well. |
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| Author: | Colin S [ Sun Dec 18, 2005 9:28 pm ] |
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I've always used standard aluminium oxide papers with no problems. I always wipe down with a tac rag then naptha and my final finish is always with shagreen and scraper. I always FP so that might make a difference. Colin |
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| Author: | Terry Stowell [ Mon Dec 19, 2005 12:28 am ] |
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What is the PURPOSE of stearates in sandpaper? non loading? |
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| Author: | Tim McKnight [ Mon Dec 19, 2005 12:57 am ] |
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Sterrates are a dry lubricant and they also reduce finish loading of the sandpaper. Like Howard said, if you stir lacquer sanding sealer you will notice the white milky stuff - that's the sterates which are in suspension. |
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| Author: | Terry Stowell [ Mon Dec 19, 2005 2:23 am ] |
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Thanks, that's what I thought, but didn't know the "solids" in sealer were stearates. But since sealer sands so easily, it makes sense. Thanks Tim. BTW, I usually wet sand through from 400-whatever is the highest grit in my micro-mesh sanding cloths BOB -did any of the previous posts answer your question? |
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| Author: | Tim McKnight [ Mon Dec 19, 2005 6:33 am ] |
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Terry: I should have added that not all of the white milky stuff is sterates. They also add more solids to the sealer as well. |
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| Author: | bob J [ Tue Dec 20, 2005 12:42 am ] |
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Thanks much guys |
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