Is there any product out there that allows one to make their own sponges? Something akin to a 2-part resin product you might pour into a mold and allow to cure. Or does the process of making synthetic sponges require temperatures and/or pressures so high as to exclude them from “hobby” production.
I ask because I am making some custom injection phantoms for the company I work for that have our logo on them. The media that captures the liquid is a sponge encased in a rubber shell. And it would be really efficient if I could cast the shell, then cast the sponge in the cavity filling it perfectly. Currently I have to “float” or embed a piece of sponge in the rubber while it is still liquid. This requires a ton of attention from me during the 1-2 hours that the rubber is becoming solid enough to hold the sponge and not allow it to float to the top of the mold.
Any advice would be great – even if it is that such a product doesn’t exist. Which is what I am starting to think since I can’t turn up anything Googling.
Or…is there a good way to cut plastic sponges?