Forum Discussion

RVhiker's avatar
RVhiker
Explorer
Feb 01, 2015

New Skylight: Dicor, or Eternabond, or both?

I'm putting a new skylight on my trailer. I have used Eternabond over all caulking on the roof. The new skylight will be installed using butyl caulk between the lip of the skylight and the roof membrane.

Should I:

1) use Eternabond only over the screws and lip of the skylight
2) or should I first use Dicor, let the Dicor cure, and apply Eternabond over the Dicor?
  • Ed_Gee's avatar
    Ed_Gee
    Explorer II
    Feb 01, 2015
    I believe Eternabond is supposed to be applied to a CLEAN RV surface, NOT on top of Dicor! Many new coaches I've looked at only have Eternabond on the roof main joint seals. Mine has some Dicor applied to the top of the Eternabond. When properly applied, Eternabond is pretty good stuff.
  • 2oldman's avatar
    2oldman
    Explorer II
    Feb 01, 2015
    Maybe you'll be luckier than I with sealing a skylight. No, I didn't install it, but I had a small leak that I could never patch, even with EB and caulk.

    Finally ended up painting the frame with several coats of Heng's roof seal. Leak gone.

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