[alt-photo] Re: PVA for SIZE & GUM ??

[Loris Medici]

Geoff, "acrylic" gesso isn't the same thing as "PVA" size / glue at
all. They're completely different compounds... I've tried many acrylic
products and they were all making the support too slick for my liking
and my most successful attempts were only moderately so. BTW, you'll
definitely have to add something into the acrylic gesso to make it
work with gum. (Calcium carbonate powder / marble dust, pumice and
such... Even gelatin!)

Regards,
Loris.


2010/3/6 geoff chaplin <geoff at geoffgallery.net>:
> Thanks - that’s useful. Reading this and other material I'm guessing the
> 'pva size' is similar to what other manufacturers refer to as 'acrylic
> gesso'. The two other products I referred to before describe themselves as
> 'gesso' or 'acrylic gesso' and are intended as sizing for use by artists.
> They seem to work for gum sizing - does anyone know if they are actually
> basically the same as the Gamlin size? If there are differences do we know
> what they are? Has anyone compared these products and is one clearly
> superior?
>
> Incidentally Gamblin is not a product easily available where I live, hence
> one of the reasons for the interest in its make up.