Sealing/caulking awning and spoiler

I have used Jasco Green Odorless Mineral Spirits to remove excess lap sealant followed by denatured alcohol to do the final surface preparation. That has worked well.

We have not experienced screws pulling out. However, when the sun beats down on the black plastic, it can soften. That exacerbates the buckling between the screws. It does not appear that there is enough force to loosen them. Expansion and contraction of a metal spoiler would also have issues though perhaps not the same as those of the plastic spoiler.

As for cleaning with xylene, it is a rather aggressive solvent. It is not one I would use on my R-Pod. It is always best to see what the manufacturer of the product one wants to use recommends for surface preparation. Denatured alcohol is what Dicor recommends. If Eternabond also recommends it, then that is what I would use.

GlueGuy, the spoiler is made of soft flexible plastic, probably some kind of vinyl with a flex additive and it's isn't likely that fiberglass would stick well.  Another option would be to use the old spoiler as the template for a mold and recast a new spoiler made of fiberglass, but that's a lot of work if you don't have a workshop set up for fiberglass.

Another thought I had was that you might be able to "fix" the spoiler? I don't know what the spoiler is made of; it looks like plastic, but I don't know what kind. I've worked with fiberglass and epoxy, and polyester resins. I think you might be able to reinforce/thicken the leading edge of the spoiler with an inch-wide strip of fiberglass. Maybe only one or two layers. This would make it much less likely to warp when screwed down. Maybe more work than it's worth, but I am sometimes known for my propensity for fix overkill.

Thanks Glue —  that's reasonable.  And after pulling the spoiler and cleaning everything up, that is about what I had intended to do.  Definitely plan to use stainless screws and caulk wiring holes as well as screw hole points in the filon. As for the Eternabond tape (which I have successfully used in other applications), I currently have that on the leading edge and the sides, but in the cold it seems not to have held very well despite the surface having been cleaned with Xylene. But I will likely also caulk the leading edge and sides with either Dicor or Proflex.  My problem is a badly warped spoiler, so I have a new one on order.  They come with some sort of adhesive tape already on them.  We'll see.  I understand your point about no concern for water under the spoiler once the wiring holes and screw holes are caulked, but I don't share your confidence.  I believe the spoiler moves and pulls on the screws, and FR says the entire thing should be caulked.  Weep outlets on the back side, however, may make sense.