Capricorn Artist Collage making techniques

I’m a big fan of Gary Reef’s work even if I question it’s archival stability. Painting acrylic over oils will lead to issues in the future, the acrylic will eventually peal off the top of it, but damn it’s so purty I can’t still looking. I love how he wantonly mixes his materials and makes beautiful techniques that would have given my art profs in college heart attacks. (Oils and acrylic arggghhh…..) That being said I wonder how onde could create some of these techniques without the mad mixing?