We ran out of cerdec and can't get any over here , None of the local laser guys here in South Africa are carrying cerdec anymore..they recon its too expensive..
So I tried using straight plaster of paris and it works a charm...using it on Stainless and titanium. I tried my scotchpad torture test (Vigorous high pressure rubbing for at least a minute) on the resultant mark (and the same on a cerdeced mark) and it held up as well as the Cerdec. We just have to run a little slower for a good mark..the mark is also not quite as black but nothing to be that concerned about as we are doing industrial type work. Only bug bear is that the stuff sets so when mixing , we don't have a long time to apply , washing off is no problem.