I am quite surprised that your previous transfers from plexi to papers with
a 3% size (irrespective as to hardener) were successful. You really need a
fairly thick layer of gelatin to make this kind of transfer, in the 8-12%
range.
If you want to make a tranfer from plexi onto your existing paper (7% size,
hardened in Glyoxal) you will need to use a gelatin mounting adhesive. This
is nothing but a 3-5% gelatin solution, of which you pour about 10-15 ml
(warm) on the center of the final support paper. Then combine the plexi and
final support and squeegee thoroughly. This will give you a complete
transfer with no loss of highlight detail.
Sandy King
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