I use Future floor polish which is clear gloss water base acrylic available in supermarket and hardware stores
Lots of info for using it on internet. Brush some on surface to be decaled ,a gloss surface is best but use a little extra and you can decal on flat surface.
Apply decal , future may make decals difficult to position but you can thin future with a little water, blot up any excess future, use setting solution to help with making decal settle in, but I found that as the future dries it pulls the decal down. When finished Dullcoat decals to flatten finish
Before cutting off desired decals spray decals with a thin coat of clear gloss rattle can spray to give old or super thin film decals extra strength
