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Ok, everything is right, but you DO need to add a flexible additive to both the primer and the color/clear coat paints. Also, get your viscosity right, fisheye additive in high humidity, etc., etc.
The reason the old stuff cracked off is cuz it wasn't flexible enough to take the movement in the spoiler.
Any automotive paint supply shop should be able to sell you a can of the additive. Some also have demo pieces that SHOW you the primer/color/clear coat really works and will take quite a bit of flexing without breaking off.
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