I use ceramit occasionally. It is essentially colored epoxy -
probably more accurately fiberglass resin. It's pretty painless - mix
it properly, it has a long pot life, and then it can set for 24 hrs.
I believe it is, or it can be accelerated (and it's harder, I think)
in an oven at 200deg or 250. And you can mix the colors. A couple of
things: they say it can be polished but don't believe it - the
porosity of it picks up and holds the polishing compound and it gets
dirty. And the hardener, especially, being very thin will seep out
through the lid if you lay it on it's side. I bought the large can of
hardener and keep it separate. But, for an easy source of
enamelesque plastic resin, yes, it's a fine product.....