Rae has done this with her WPPD Quinninup group - In daylight her exposure was 5 hours which gives a fairly soft image - Waxing the paper is correct, but if you are using RC paper that will not work as the wax will not form a "light pipe" in the interstices in the paper

My suggestion, and Rae has not tried this, is to make your own paper negs on a strong thin paper that will support liquid emulsion, when the neg' is dry wax that and see how you go

(Has anyone tried an inter-egg pinhole as at http://www.lomography.com/magazine/l...pinhole-camera that I saw on APUG yesterday?)