See this topic for other ideas on drying stamps:
https://goscf.com/t/12959Here's how I go about drying stamps:
Allow stamps to air dry on a towel for about 10 minutes, then transfer to the following setup:
Manila file folder which has plain white paper and wax paper inside.
Open manila file folder.
Place stamps face down on white paper.
Place wax paper on top of stamps. This way any residual gum will stick to the wax paper.
Close manila folder.
Place manila folder under a heavy book. I've found that two volumes of the Scott catalogs are sufficiently heavy.
Repeat.
Manila folders can be stacked on top of one another.
The manila folders absorb a lot of moisture. As long as the white paper is smooth, you won't have any wrinkles. I check the stamps at 24 hours and put in fresh paper if necessary. Then I usually leave them in for another 24 hours.
Another tip for soaking stamps is to sort them by country and era if you can. They will then take about the same time to soak and dry.