Sealing/caulking awning and spoiler

I didn't remove the foam. The hardest part was cleaning off the old Dicor sealant.
It lasted well until it had to go to the factory for the accident repair. The roof was replaced as was the spoiler. I haven't gotten around to getting on the roof to check this spring.

I ran a bead and set the foam on that, then made sure the edge was sealed.

Part of the difficulty in sealing the spoiler is that it is made from what appears to be polyethylene (LDPE) plastic (Like a Walmart storage tub).  The advantage is it’s inexpensive to produce. The downside is that it’s very difficult to find an adhesive or sealant that will adhere to it. Even the adhesive foam tape on a new one peals right off. The sealant used on the LED running lights on the inside of the spoiler appears to be regular automotive RTV gasket making sealant. It rolls right off clean if you rub it with you finger.  No adhesion. 3M 5200 adhesive/sealant will bond to it but is permanent. Truly permanent. 3M 4200 bonds very well and is not permanent. I intend to remove the foam tape, rough the bottom edge of the spoiler and then bed it on a thick bead of 4200, screw it down with stainless screws, and caulk around the outside edge, probably with more 4200. I don’t believe silicone adheres to it. 

Thanks Stephen.  I've planned to check the Dicor before investing in the 4200. Though the 4200 is both a sealant and a fairly strong adhesive.  Did you run the lap sealant around the outside edge, also.  Clearly, silicone is unsatisfactory for that purpose.

This has been an interesting thread.  I had no idea I would need to be looking at resealing anything on our new RPOD for some time to come.