I could be sick.

[guzzijim]

Rather than buy in moulding that you don't think you will use again, take some unfinished moulding (or a finished one - sand it down a bit first). then take a tube of red acrylic paint and a tube of white, mix a bit up with a little water. Put a couple of coats on, and then some clear wax, or acrylic varnish to protect it, and voilà .

Having a go, bought some acrylic pink from the local paint shop, it's a test pot from one of those mix any colour machines, so far so good.
Next is the mount board, the lady says eau-de-nil, translated roughly, water of the Nile. Ah! greenish yellow polluted Nile water and pink i'm beginning to feel queasy.

[Gesso&Bole]

Sounds like a lovely combination- good luck!