Very nice but Rage wasn't designed for plastics. Try Evercoat Polyflex (part# 100411) after heating
the area. Or 3M Automix EZ Sand (part# 5895) after a coat or two of adhesion promoter (part# 5907).
Then sand P400/P800 and it's ready for sealer and bc/cc.
Evercoat
3M(TM) Automix(TM) EZ Sand Flexible Parts Repair
Which sealer are you using?