Dry mount damage to print with print shield

[dan_linne1]

I used PremierArt print shield on a luster paper. The frame shop dry mounted it

resulting in a mottled surface. I had to do the print over. Should it have been

sprayed after mounting? I have not heard of this problem before. Too much heat?

Moisture? Wrong cover sheet?

[steve_bingham]

Yes. The mounting heat is not good for any type of archival spray.

[frans_waterlander]

Many papers can't survive the 150 t0 170 degree F or so for dry mounting without some issues, like the mottled surface you (and I) observed or thin dark lines in smooth areas like blue sky that I observed. Matte papers seem to be doing a lot better in this regard. I dry mount Epson matte papers at 170 degree F for 30 seconds without any issues.