I can picture the PMC slip working. I will try it with some Prips
flux as a thinner.
Well, I guess you could try adding flux as an experiment, on scrap,
but PMC is fine silver and should not benefit from flux. A better
choice as a thinner would be lavendar oil and/or water. Lavendar oil
is used to help PMC adhere to already-fired metal clay or sheet
metal. I’m not sure what exactly (if anything) it contributes, since
it does not make the metal clay stickier, but it evaporates cleanly
and quickly, and is widely used for this purpose.