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Topic: help with sanding/buffing?  (Read 572 times)
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kabili
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Joined: 07-Feb-2004

I'm not a llama anymore!


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« on: September 29, 2007 11:47:24 AM »

hey eveybody,

i am completely new at poly clay and have been doing some reading here on craftster and at diane b.'s glass attic. i made some flat tiles that i want to sand and buff, and maybe add some kind of polish/finish to make them more shiny. i read that using a dremel is a good way to do the sanding and buffing, so i tried it. i'm not sure what i'm doing wrong, but i can't tell any difference between tiles i've worked on and those i haven't! maybe i'm not doing it long enough? maybe i'm using the wrong tools? here's some pics of everything; i'm hoping someone can offer some suggestions. first, here's some of the tiles. the blue ones have some transparent clay marbled in. the whitish ones are all transparent clay, and have some silver leaf on them.

.

this is my dremel and the attachments i've tried for sanding/buffing.


and here's the other attachments i have in my toolbox. do i have the right things, or do i need to go get something different?



thanks for whatever insights you can offer!
THIS ROCKS   Logged

where are we going, and why am i in this handbasket?
Diane B.
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GlassAttic --polymer clay "encyclopedia"


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« Reply #1 on: September 29, 2007 12:21:59 PM »

Hi,

First, you can't sand with the regular Dremel sanding bits... they're way too abraisive for baked polymer clay (which is fairly soft compared to the metals and even wood that those bits are intended for).

The easiest thing is just to sand them by hand with wet-dry sandpaper and a little water using first 400 grit, then 600 grit (if they're really lumpy-bumpy-etc, start with 320 grit).  Don't skip grits when sanding though, like from 320 to 600, or from 400 directly to 800 or 2000 --won't give a good result.   (There are other ways to sand as well... see Sanding page below for those.)

After that, you'll need to buff.  
If you want to get a high-gloss shine (and no liquid finish would be needed), you'll need to use an electric buffer of some type though because if you buff only by hand, you'll get only get the clay surface up to a nice sheen instead of a glassy gloss.

Many of the buffing wheels that come with a Dremel (or other brands of rotary tool) are too stiff to work well with polymer clay though (in fact the solid felt looking ones will act more like sandpaper on baked clay than like buffers).  
What you'll want it to use one of the (many-layered) muslin-cotton buffing wheels sold for rotary tools, but it's best to remove the outer ring of stitching even from those to make them fluffier and less stiff.  
There are other buffing wheels that can be made, or purchased, for the Dremel that work well with clay also.  Or other kinds of electric buffers can be used.

There's loads more info on using Dremels specifically for "sanding" and buffing clay on this page at my site:
http://www.glassattic.com/polymer/tools_Dremels_worksurfaces.htm
(... click on Buffing ...)

If you want to read more about sanding and buffing the clay using other things besides a Dremel (i.e., sandpaper, etc.), check out these pages:
http://www.glassattic.com/polymer/sanding_tumbling.htm
http://www.glassattic.com/polymer/buffing.htm


You can also just use a liquid gloss finish to get a high gloss on baked clay (often without sanding at all, though fingerprints and dings will still show through), and some clayers even do both sanding/buffing and liquid finishes, sometimes alernating them.  
If you want to read more about liquid finishes and which work well for clay and how to apply them, etc. , look on this page:
http://www.glassattic.com/polymer/finishes.htm

You might also be interested in this previous thread on finishes:
http://www.craftster.org/forum/index.php?topic=190875.0


P.S.  Be aware that you could sand off parts of metallic leaf or powders or paints, etc. which had been applied to the surface of the clay... so you might want to use only a liquid finish if you want to make sure none of that gets sanded off too. 

HTH,

Diane B.
« Last Edit: March 15, 2010 09:10:55 AM by Diane B. » THIS ROCKS   Logged

POLYMER CLAY "ENCYCLOPEDIA" 
http://glassattic.com/polymer/contents.htm
few of my photos
http://s96.photobucket.com/albums/l163/DianeBB
(had to move them from YahooPhotos, so many now without captions)
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