I have just sprayed Phoenix varnish over the running board of my model. The finish was a bit speckly so i wanted to re-paint over the varnish. I waited 24 hours then rubbed down but the new finish is worse . i think there was a reaction between the varnish solvent and underlying paint. Has anyone any experience of painting over a previously varnished model, or do i have to completely strip down and start again. Any advice much apppreciated
I have 'blinded' varnished surfaces with a coat of emulsion paint in the past on household doors and the like, it worked well and prevented solvent attack so I guess it would work in this case
It may be worth trying a coat of shellac. It can work as a good intermediate finish, binds to just about anything and most finishes will bind to it too. It is often sold as 'sanding sealer'.