[alt-photo] Re: Multi coat Gum -3rd+ coats tends to wash off

[John Brewer]

Hi Peter,

What paper, including finish, are you using? What are you using as a size?

J

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
pfriedrichsen at sympatico.ca
Sent: 23 February 2010 19:11
To: alt-photo-process-list at lists.altphotolist.org
Subject: [alt-photo] Multi coat Gum -3rd+ coats tends to wash off

Has anyone experienced the following problem?

When doing three or more separate coats of gum, I find that the third (and
all subsequent)coats have a tendency to wash off. The wash off occurs only
where the previous undercoats remain. In areas where the paper remains
uncoated (highlights), the top coat will anchor. I am guessing that the
fibers, voids, etc are being filled in and the top coat has little left to
anchor to.

There must be something that I do not have right but am unsure of what that
might be. When I tested the individual coats on clean paper, they adhere
well and do not flake or wash off and produce an image with good scale.

Any ideas?

Peter Friedrichsen

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