Why is my mask yellowing? I used spray paint and matte clear coat like they did for the film (just until I can get some paint and latex for a permanent bond) :
Clear Coat for Water-Based Paint and Coatings
LiveLoveDIY: 10 Things You Should Know About Spray Paint
Spraying budget clear with a hvlp spray gun - YouTube
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The Best Clear Coat for Painted Wood, 2024 (Tested & Reviewed)