Both products seal RV roofs — they just shine in different places.
Use lap sealant when…
- You’re sealing horizontal roof seams, vent bases, and skylights
- You need material that can level / fill deeper voids
- You’re doing a full fixture encapsulation on the roof deck
Start with Forever Extra Leveling Lap Sealant for vents and penetrations.
Use non-sag sealant when…
- You’re sealing vertical joints, windows, doors, trims, or moldings
- You need the bead to stay put without running or slumping
- You’re working on sidewalls or upright transitions
Grab Forever non-sag super sealant (single tubes, 3-packs, and promos).
Quick rule of thumb
Flat roof fixtures → lap / extra leveling. Vertical surfaces → non-sag. Many roofs need both.