[Downriver Tackle]

It's not the acrylic, it's the solvents in it. Good auto grade acrylics are all cut with ketones and other strong solvents. You might want to give some of the exterior acrylics for wood a try, like Minwax or similar. Those are cut in mineral spirits generally and should be fine and have UV protection. Always spot check the materials in question first. Another option is waterborne acrylic or urethane.