File puptcrit/puptcrit.0501, message 129


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


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