From: "Mathieu" <creaturiste-AT-magma.ca> To: <PaperMacheArt-AT-yahoogroups.com>, Date: Wed, 12 Jan 2005 17:28:14 -0500 Cc: Subject: [Puptcrit] Re: gloss problems Thanks CB for the scientific answer. And please thank your chemist contact! Sure makes a lot of sense! I will go hunting for the finest glass beads as soon as possible. All my attempts at killing the gloss over my paint job failed last night, I lost most dark details, so I had to repaint the whole mask. The overall appaearance is much better. This time I added the matte medium in each paint mix, and the result is acceptable, though not perfect. Still a bit dusty. I remembred that a dry-brush application (rubbing the paint with a stiff, dry brush) is always matte, so I used that technique for emphasizing the volumes by darkening the "valleys". Mathieu René Créaturiste Marionnettes, Masques, Etcetera... Puppets, Masks, Etcetera... creaturiste-AT-magma.ca www.creaturiste.com (514) 274-8027 ----- Original Message ----- From: <tozuss-AT-aol.com> To: <puptcrit-driftline.org-AT-lists.driftline.org> Sent: Wednesday, January 12, 2005 3:36 PM Subject: Re: [Puptcrit] Re: gloss problems >i asked a chemist about the paint problem mathieu presented. here is the > chemist's reply..... > > Matte and gloss response in architectual coatings are basically > controlled > by binder to pigment ratio . I'll spare you the treatice. > > However in the system under discussion it is desired to have mostly > binder > - ( acrylic polymer) in order to retain the clear transparent character > of > the finish. > > So in this case the mechanistic approach must be to increase the surface > roughness - since this increases light scattering and reduces gloss. > > Surface roughness can be increased through use of a transparent pigment > as > a minor component mixed with binder.. > > 3M sells a product that is glass microspheres of various particle sizes. > These are transparent when blended with a binder (such as acrylic resin) > > Yet dramatically affect the light scattering of the system. > > I would suggest that the artist first apply the clear coat then add on > top > a second thin finish coat of acrylic + glass microspheres product. > > Very fine high grade sand may also do the same trick: I have blended > fine > sand with epoxide resin in order to produce a clear non-skid deck finish > for a boat. > > Experiment first on a test surface to see the effect. > > CB _______________________________________________ List address: puptcrit-AT-lists.driftline.org Admin interface: http://lists.driftline.org/listinfo.cgi/puptcrit-driftline.org
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