I'm having really bad results with exterior trim protectants

I applied Meguiar's Supreme Shine protectant from a new bottle, it is for vinyl, rubber, plastic trim. I put in on with a cloth mostly on plastic exterior trim, wiped excess off.

This morning it showered a bit at work. The trim looks terrible! It's all full of streaks. You can see the rain made the protectant on trim on top of door .... run down onto the paint on the door.

This stuff seems like garbage! Unless one must wipe every bit of excess of the trim which seems stupid. I've seen something similar using Meguiar's vinyl and rubber protectant. I've been avoiding trim protectants, but it's something that needs to be kept up with.

Would 303 aerospace protectant be good for the plastic on like, the rear window wiper, between side windows, etc ... ?

 

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I talked to an advisor at Meguiar's who confirmed the protectant is water-based, that's why it runs off if it rains soon after applying.

The advice was to wipe off all excess product after applying.

So, how does 303 protectant not run off with rain?

Answer (from 303 advisor : must wipe 303 completely dry after application.

 

Can anyone verify that 303 aerospace protectant does not dull black plastic trim nor give it a matte or flat black appearance?

I've got a supplier for 303 picked out but don't want to be disappointed after getting a $15 bottle.


I ask because the Meguiar's Supreme Shine protectant has dulled the exterior black plastic between the driver / passenger doors, turning it to more of a matte of flat black finish. I used as directed - wipe on, wipe excess dry. Plus, it shows spots if water sprinkles on it. Bad stuff. I'll use it on tires though.