I'm sorry for the confusion I seem to have caused we will try again with a few bits add . Yesterday I spent some time with some 8/9 friends at a private railway for a steam up .
During a tea break the topic was varnish or not for models
The railway boys yes to varnish the traction boys no with the stationary boys yes this was assuming you used Craftmaster enamel paint
The conversation then was due you add varnish to paint or varnish after.
The railway people add to paint , the stationary people after .
several models in use had been painted with varnish added and paint work was superb several people quoted that Chris Vine had done something similar so over to you