Hi, can anyone help please? I have nearly finished my 1st ever mural (voluntary) & 1st painting for about 20 years!! It's a bedroom wall in a children's respite centre & money is extremely tight for them.
My question is what do I use to seal the finished painting? I've used acrylics thinned with water on an emulsion painted background. I know you can buy acrylic varnish from the art shops but they are only small bottles & I would need too many as I have 6 rooms to do in total for them. Someone has suggested PVA on a 5 to 1 mix with water but they need something that will be wipeable and possibly graffitti proof?? Someone else also suggest general wood varnish as this is quite cheap.

Can anyone help at all, I would be very grateful?

Thank you, Tracy

Go to the paint store, not the home depot, but regular small paint store and ask there, they sell an array of sealers by the gallon.