Which paint for new plaster wall - previously damp?

Is the Tarmac a top coat for the plaster? I'm not familiar with this product. If so you should be able to use a primer that will go on new plaster. You typically have to wait at least 7 days for new plaster to cure. You can find the primers at any paint store. Give the walls a light sanding and then apply your finish coats. If the Tarmac is a finished product you may be able to use the wall paint with no primer.