EZ Mount Foam
If you buy unmounted rubber, we assume you will mount it yourself onto EZ mount foam. It is sticky one side (to receive the rubber) , you then trim out the image with sharp non stick scissors using vertical short cuts, and then peel off the white release paper to reveal the cling foam. All PaperArtsy index sheets are laminated, so your EZ mounted stamps will cling to the index sheet we provide with your stamp sets.
Cushion is extremely important. It allows the ink to transfer from the stamp to the receiving surface evenly. Any stamp larger than a credit card should always be mounted onto foam, and all solid style stamp images should be mounted.
You don't see any wood mounted stamps without a layer of foam, so you should mimic this by having a layer of foam between your acrylic block and the rubber too.
There are different brands of foam. We like the fact that EZ mount springs back immediately when it is squeezed, it has a nice thickness that is perfect for complicated detail stamps like the Lynne Perrella Collection.