Having exhausted my supply of custom-made decals for a project it's time to try NOS Champ decals; i.e., the ones that came in the small envelopes.
Never used NOS decals before but have read about pre-treating them with clear coat or decal film to prevent the decal from falling apart.
If you've had experience applying NOS decals, particularly Champ brand, how'd you do it to get a satisfactory result, and what didn't work well. All advice welcome.
TIA.