I would not use EternaBond tape to "cover a crack". You can not monitor the crack if you do that, and if it grows longer, starts cracking in a different direction, you won't know there's a problem until the crack grows long enough to spread from under the taped area. Tape over the crack will stop water intrusion UNDER THE TAPE, but won't stop any future physical damage to the fiberglass and will not prevent water intrusion from areas "beyond the tape". Plus, it does not address WHY THE CRACK OCCURRED in the first place. BAD IDEA !!!!!
As for replacing the cap, parts alone will run anywhere from $2K to 4K, depending on any other parts that might be damaged, then there's the risk of damaging the roof membrane and the trailer FILON sides as well as bending any aluminum molding or stripping out any screw holes in the aluminum structure.
Then after the new "plain painted cap" is reinstalled, you'll need new graphics, possibly some new aluminum molding (if the old can't be reused), and probably some repainting of scratched/damaged during shipping paint repairs to the new cap.
Labor charges will probably run another $1K to 3K depending on your area and the labor costs.
Unless you've got a covered (weather and security) area to do the work, a good assortment of power and hand tools, expertise in fiberglass work and the heavy equipment to support, lift and move the old cap and the new cap, I would not recommend a DIY approach. This is not a "do it yourself project" for a "husband/wife" team to tackle.
As an alternative, have you considered a "boat repair facility" ??? They usually have a "skilled fiberglass repair capability" either in shop or at a nearby body shop. Fiberglass boats get nicks, dings and cracks all the time, as do Corvettes. Boat service centers almost always are able to repair "minor damage" so it looks like new. Your Passport front cap is no different than the hull on a fiberglass boat when it comes to "fixing a small crack".....
You'll likely pay $300-500 for someone to repair those cracks (if you don't screw it up by putting tape on them or stop drilling the wrong place). Mess up the cap, the cost will go up.
You'll likely pay $4K-6K for someone to install a new cap. I would guess that insurance or extended warranty will not even consider a replacement for a "minor crack", so you'll likely be 100% "out of pocket" for the costs.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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