Good question Mark...
 

I try to use very light coats, it will only bulk em up if that is my intent. Krylon makes a great matte finish spray, that when applied you can't even tell it's on there, but it does preserve work well.

Dallcow,
Tried it and it worked like a charm...thanks so much!

Mark

Mark
 

Glad it worked for you. The matte spray is excellent for decal sheets too.