Drop-Stop Metal Roof Sealant

Drop-Stop Metal Roof Sealant

Drop-Stop Metal Roof Sealant

$289.63 $241.00

DROP-STOP® is a brush-grade mastic with unique physical properties. Simply apply Drop-Stop in a heavy bead over end laps and vertical seams, or in a dollop over defective fasteners (see images above). From spot repairs to full system applications, Drop-Stop products provide a long-term, economical solution to your metal roofing needs.


The Drop-Stop family of synthetic rubber coatings provide metal roofing solutions in spray, brush and trowel grade viscosities, with Drop-Stop being brush grade. Always inspect the roof to determine the best combination of materials for the repairs at hand. While most repairs can be handled with only Drop-Stop, a brush grade mastic, larger gaps may require DYNA-FLASH® with polyester reinforcement (see images below). For roofs with light surface rust throughout the roof, DYNA-SEAL® roof coating can provide a total covering to protect the metal’s long-term integrity. From spot repairs to full system applications, Drop-Stop products provide a longterm, economical solution to your metal roofing needs.


Before applying Drop-Stop, the roof must be free from grease, dirt, moisture, and all foreign material. Using a power washer is the recommended method. For small repair jobs, one could use a brush and water (repeating if necessary) until the target repair area is properly clean. Remember to let the area dry before applying Drop-Stop. Apply Drop-Stop in a temperature range of 40°F to 120°F.


  • Unlike most asphaltic or acrylic coatings, Drop-Stop will not crack or become brittle over numerous freeze/thaw cycles
  • This unique material actually stretches and recovers to bridge roof joints in which thermal movement can be expected
  • Drop-Stop is typically stocked and purchased as white in color. Clear Drop-Stop is also stocked for skylight panel restoration
  • White Drop-Stop is U.V. stable but clear Drop-Stop is only moderately U.V. stable
  • After application, Drop-Stop has a service temperature range of -40°F to 120°F
  • A factory sealed, unopened can of Drop-Stop has more than a 5-year shelf life if stored in moderate temperatures

Physical Properties/Specifications (White)

  • Package: 5 gal 
  • Dry to touch: 2-3 hrs
  • Fully cured (@ 72°F): 3 days
  • Elongation (ASTM D-412) @ 77°F: 600%
  • Recovery from 600% elongation: 99%
  • Recovery from 100% elongation (ASTM D-412): 100%
  • Tensile strength (ASTM D-412): 1500 PSI
  • Permeability, water vapor (ASTM E-96): 0.15
  • Color stability: Excellent
  • Resistance to sunlight: Excellent
  • Resistance to chemicals: Excellent
  • Weathering effect: Slight chalking
  • Adhesion to aluminum (ASTM 3359-80): 5 (highest rating)
  • Adhesion to steel (ASTM 3359-90: 5 (highest rating)
  • Cold temperature flexibility: Excellent
  • Abrasion resistance: Excellent
  • Resistace to foot traffic: Excellent
  • Approximate coverage: 75 ft2 per gallon
  • MSDS available

Note: This product can only be shipped via ground

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