Dear Mr. Martin,
If you use our new CASTALDO LiquaCast RTV rubber ( which is stronger,
easier to use and cheaper than silicone RTVs) you can write on the
resulting molds with an ordinary marker
If you must use silicone RTVs despite the disadvantages, the only solution
is to mold the markings you want into the rubber itself. It’s easily done.
Do you have a Dymo plastic tape marker?? The kind that embosses letters on a
self-adhesive label tape? If so, merely emboss what you want to write, mount the
tape (outside-in, of course, so the image won’t be reversed) in the mold frame and
pour as usual.
Your finished mold will be permanently molded with the info.
By the way, this works just as well with vulcanizing rubber except that
you have to buy special aluminum tape ( made for plant nurseries, etc.)
instead of plastic tape for obvious reasons.
Are you ( or anybody else out there ) interested in a free sample of our
new LiquaCast RTV rubber??? If so, please send me your shipping address–
no P.O. boxes.