Re: Mediums 161 by nadeem sumair on 12/07/00 at 8:45 PM
Re: Mediums

In Reply to: Re: Mediums posted by Rob Howard on 11/18/00 at 8:38 AM:

I was told that if I cut it with Stand Oil and Galkyd (more stable ingredients) that any of those possible dissasters from straight LIQUIN will be avoided. Does this sound accurate?<<<
: __________________________________

: I'd file that with eyewitnesses of Santa Claus and the Easter Bunny. First understand what alkyds are. There are two broad chemical groups...acids and alcohols. These are not the common acids and alcohols but have names like pentaerythritol and phthalic anhydride...not the stuff you're likely to find in your medicine cabinet. There are many more alcohols and acids that can be used (BTW the term "al-kyd" was originally al-cid, ALcohol+aCID) When these are mixed together that make a thick glop that's impossible to paint with unless thinned with some heavy-duty solvent, as they do in industry.

: What artists use are OIL-MODIFIED ALKYDS. The oils are drying oils, usually soya or tobbaccoseed oils with (maybe) a dash of linseed thrown in. Most of the alkyds offered to artists are virtually identical and with the exception of the advertising hype that surrounds them, they're all pumped out of the same barrel.

: Oil modified alkyds ahve a tendency to "sheet" just like polyurethane finishes. If you've ever used a polyurethan floor finish you know that you should follow the first coat with a second coat as soon as possible (4-6 hours) in order for chemical bonding to occur. If, however, you wait until it's totally hardened (overnight_ you must sand the surface in order to make a tooth and a mechanical bond or the subsequent coating will peel off in sheets. Obviously, sanding between coats of an artistic painting can cause damage to thin, delicate passages.

: Galkyd is composed of the same old alkyd resin with the addition of super-special secret ingredient strained through organic virgin's hair and lovingly massaged by ecologically sensitive masters of the advertising copywriter's art. If you buy into any of Gamblin's hype, I've got a nice bridge to sell you.

: Why not simply avoid alkyd resins and use traditional materials?




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Post a Followup 137,138,161"> nadeem sumair"> nadeemsumair_hotmail.comRe: Mediums_12/07/00 at 8:45 PM"> "Re: Mediums"
: I was told that if I cut it with Stand Oil and Galkyd (more stable ingredients) that any of those possible dissasters from straight LIQUIN will be avoided. Does this sound accurate?<<< __________________________________ I'd file that with eyewitnesses of Santa Claus and the Easter Bunny. First understand what alkyds are. There are two broad chemical groups...acids and alcohols. These are not the common acids and alcohols but have names like pentaerythritol and phthalic anhydride...not the stuff you're likely to find in your medicine cabinet. There are many more alcohols and acids that can be used (BTW the term "al-kyd" was originally al-cid, ALcohol+aCID) When these are mixed together that make a thick glop that's impossible to paint with unless thinned with some heavy-duty solvent, as they do in industry. What artists use are OIL-MODIFIED ALKYDS. The oils are drying oils, usually soya or tobbaccoseed oils with (maybe) a dash of linseed thrown in. Most of the alkyds offered to artists are virtually identical and with the exception of the advertising hype that surrounds them, they're all pumped out of the same barrel. Oil modified alkyds ahve a tendency to "sheet" just like polyurethane finishes. If you've ever used a polyurethan floor finish you know that you should follow the first coat with a second coat as soon as possible (4-6 hours) in order for chemical bonding to occur. If, however, you wait until it's totally hardened (overnight_ you must sand the surface in order to make a tooth and a mechanical bond or the subsequent coating will peel off in sheets. Obviously, sanding between coats of an artistic painting can cause damage to thin, delicate passages. Galkyd is composed of the same old alkyd resin with the addition of super-special secret ingredient strained through organic virgin's hair and lovingly massaged by ecologically sensitive masters of the advertising copywriter's art. If you buy into any of Gamblin's hype, I've got a nice bridge to sell you. Why not simply avoid alkyd resins and use traditional materials?

 
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