Sand Free

Found it using this new tool called Google. Works great!

https://www.amazon.com/dp/B00B3HXM6I/?tag=fabo03-20
Sand Free Adhesion Promoter | 38363 | SEM Products
SEM 38363 Sand Free Adhesion Promoter
SEM-38363 Sand Free Aerosol

Not sure if this is the same thing you are looking for. This is for painting plastics. It helps soften the plastic so the paint bites.