You missed one CRITICAL step that prevents automotive paints like Dupli-color from separating/blistering/peeling off plastic, Bulldog Bite.

Custom shops that refinish OE interior panels swear by the stuff.

This stuff even makes paint stick to chrome bumpers!

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!