Contractor Supply - Bone White
  • Contractor Supply - Bone White

    Reference # 43


    (60) Pails of Bone White Polyprene

    Freight Included (Continental US, AK and CA Excluded)


    Polyprene® is an all rubber, universal roof repair cement used for flashings, seams, pitch pans, cracks, splits and making various repairs on all roof types. It provides you with a long-lasting, water-tight, 100% rubber seal. Polyprene® was voted the #1 repair compound among roofing professionals. The heavily fibered high-solids content prevents mud cracking, making it ideal for pitch pans as well as to seal seams, cracks, around vibrating rooftop equipment, skylights, vents, flashings, and more. In emergency situations, wet surface adhesive agents allow repairs even to damp metal.

    • Quickly and easily reinforces critical areas
    • All rubber, fiber reinforced — stays flexible and won't crack when cold
    • Wet surface adhesive agents allow repairs to damp metal, when required
    • Easily incorporates PolyCore™ reinforcement polyester, when needed, for extra strength
    • Can be applied thick, in one layer, without the threat of mud cracking
    • Available in Heavy Brush Grade & Trowel Grade for ease of use and versatility



    850% min 

    Water vapor permeability

    .25 perms


    400 pen

    Weight per gallon

    8.8 – 9.3 lb.

    Solids total


    Flashpoint of solvent

    104° F

    Dry to touch @ 77° F (50% rel. humidity)

    ~ 12 hrs

    Ultimate Elongation


    Ultimate tensile strength

    600 psi min.

    Peel Adhesion

    4.3 pli min.

    Service Temperature:

    -40° - 140° F

    Moisture Resistance:



    Q: I have a leak in one of the seams of my roof, what is the best product to use to fix it?

    A: To fix a leaking seam the best product for the job is a 100% rubber elastomeric roofing caulk like Polyprene®. Secure any loose seam with Polyprene beneath the joint.  Seal all seams using polyester PolyCore embedded into a layer of Polyprene. Because it holds its pliability, Polyprene® won’t split or crack over time, which could cause leaks to recur.

    Q: Which Polyprene® should I use to seal large gaps in my roofs surface?

    A: Polyprene Trowel Grade is thicker with enough body to fill gaps up to ¼” without sagging. It cures to a tough rubber seal that is strong.

    Q:  Are there different grades of Polyprene for different roof types and uses?

    A:  Yes. Polyprene for EPDM/PVC is specifically for use on EPDM and PVC membranes.  Polyprene Heavy Brush Grade is versatile for most caulking repairs (seams, cracks, flashings etc).  It spreads quickly and easily around penetrations and seams yet holds tight to seal out moisture.  Polyprene Trowel Grade is a more viscous cement. Use for when you need body, build-up or fill larger gaps up to ¼”.