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Dicor 501LSB-1 HAPS-Free Self-Leveling Lap Sealant for horizontal surfaces - 10.3 Oz, Black

Dicor 501LSB-1 HAPS-Free Self-Leveling Lap Sealant for horizontal surfaces - 10.3 Oz, Black

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$19.24at FixTimberChecked Nov 9

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Price facts

  • Last seen at $19.24 at FixTimber on Nov 9.

Our take on the Dicor 501LSB-1 HAPS-Free Self-Leveling Lap Sealant for horizontal surfaces - 10.3 Oz, Black

Dicor 501LSB-1 is a self-leveling lap sealant in a 10.3 oz tube for horizontal RV roof surfaces. It flows out to a smooth, sun-stabilized bead that bonds to EPDM, TPO and PVC membranes and also grips aluminum, wood, fiberglass, galvanized metal and concrete. It is the standard touch-up and reseal product for RV owners maintaining roof seams, vents and edge trim. Rivals like Heng's and Alpha Systems offer similar self-leveling sealants, but Dicor is the name most RV forums and manuals point to for membrane roofs.

Best forRV owners resealing roof seams and vent flangesMaintaining EPDM, TPO or PVC membrane roofsFilling horizontal gaps around vents, skylights and edge trimDIY roof touch-ups between full reseal jobs
Pros
  • Self-leveling, so it spreads into a smooth bead without tooling
  • Bonds to EPDM, TPO and PVC membranes plus metal, wood and fiberglass
  • Sun-ray stabilized to resist spoiling and discoloration
  • Will not stain or discolor the roofing material it touches
  • Widely used and recommended in RV owner communities
Cons
  • Only for horizontal surfaces; it runs on vertical or sloped areas
  • Black color may not match light-colored roofs
  • One 10.3 oz tube covers a limited length of seam
  • Needs clean, dry surface and cure time before travel

Dicor 501LSB-1 HAPS-Free Self-Leveling Lap Sealant for horizontal surfaces - 10.3 Oz, Black prices at every store

  • FixTimberNew

    In stockShips from Hong Kong SAR China · duties may applyReturn policy

    $19.24Checked Nov 9
    Visit FixTimber

What reviewers say

RV owners treat Dicor self-leveling sealant as the go-to for roof seams and vent flanges. They praise how it flows out flat and how well it holds on membrane roofs. Complaints center on it being messy to apply and unsuitable for vertical surfaces.

What people mention
  • ApplicationPraisedOwners say it self-levels into a clean, flat bead with little tooling.
  • AdhesionPraisedReviewers report it sticks firmly to EPDM and TPO membranes and metal trim.
  • DurabilityPraisedUsers say seams stay sealed through sun and weather over multiple seasons.
  • Vertical useCriticisedBuyers warn it runs or sags on vertical and sloped surfaces.
  • MessMixedSome find it stringy and messy to apply, though the result is clean.

About the Dicor 501LSB-1 HAPS-Free Self-Leveling Lap Sealant for horizontal surfaces - 10.3 Oz, Black

This is a HAPS-free, self-leveling lap sealant for horizontal surfaces on RV roofs. It comes in a 10.3 oz tube in black. The polymer-based compound is sun-ray stabilized, which keeps it from spoiling and discoloring.

It levels itself for a smooth application. It does not stain or discolor the roofing material it is applied to.

The sealant works with EPDM, TPO and PVC membranes. It adheres firmly to aluminum, mortar, wood, vinyl, galvanized metal, fiberglass and concrete.

Brand
Dicor
Model
501LSB-1
Material
Polymer-based compound
Color
Black
Capacity
10.3 oz tube
Application
Horizontal surfaces, self-leveling
Compatibility
EPDM, TPO and PVC membranes
Adheres to
Aluminum, mortar, wood, vinyl, galvanized metal, fiberglass, concrete
Dimensions
11.25 x 2 x 2 inches (L x W x H)
Weight
13.6 ounces

Questions and answers

Can I use it on vertical RV surfaces?
No. It is self-leveling and made for horizontal surfaces only. On vertical or sloped areas it will run. Use a non-sag lap sealant there instead.
Which roof materials does it work on?
It bonds to EPDM, TPO and PVC membranes, and also adheres to aluminum, wood, vinyl, galvanized metal, fiberglass and concrete.
How much seam does one tube cover?
Coverage depends on bead width. A 10.3 oz tube lays a modest length of seam, so measure your seams and buy several tubes for a full roof reseal.
Does it discolor the roof?
Dicor says it will not stain or discolor the roofing material it is applied to, and it is sun-ray stabilized against spoiling.
How long before I can drive?
Let it skin and cure before travel. Check the tube for the cure time and keep the roof dry until it sets.
Is it the same as the non-sag Dicor sealant?
No. This is the self-leveling version for flat surfaces. Dicor's non-sag formula is the one for vertical seams and corners.
Where is the Dicor 501LSB-1 HAPS-Free Self-Leveling Lap Sealant for horizontal surfaces - 10.3 Oz, Black cheapest?
At FixTimber, for $19.24, as of our latest check.

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