My suggestion would be to use RC paper - whichever kind you would like (I've
heard some complaints that Kodak's paper will show the word "Kodak", as it's
printed on the back - I never saw it when I used Kodak paper as a negative).
The paper is not thick, like double-weight fiber, and does not have curling
problems like fiber - especially single-weight.
I've not used it with gum, so I can't help you there (mostly with pinhole).
george
--Handmade Photographic Images http://www2.ari.net/glsmyth/