Wow. Just discovered this thread with so much disinformation....
We have both Smith's Cream & Smalts available to the sign industry on our website, so you could say we have the experience. Our supplier used to be Rick Glawson of Esoteric Signs as well. However, after his passing, his shop closed, leaving one source with limited supplies. This has been quite an endevor for us, as we are keeping this tradition available and alive!
First, Smith's Cream is not the binding agent for smalts. Smith's Cream, is actually the agent that allows a longer drying time for the enamel...the enamel is the binder. The Cream is colorless and oil based, so it must be mixed with enamel that will match the color of the smalt that is to be applied. Smith's Cream also allows for a thick "bed", applied liberally, for the smalt to lie in and adhere. I have heard of using epoxy for this procedure, but have yet to use this method myself. If you have used this method, please share so we can pass along this knowledge.
Typically we apply the smalts to our dimensional signs. This smalt is "fine" and is roughly 1/8" in size. When routing the sign, all elements that will not be smalted will have a 1/8" raised outline from the smalted area. This allows for the Smith's Cream and enamel mixture, 50/50, to be applied to the background only. As mentioned, anywhere the binder is applied, smalts will adhere to. This includes the returns on all of the raised elements, hense the 1/8" x 1/8" outlines.
Hope this helps all with future projects!!
Best to all,
Keith Jenicek
Artisan Signs