Harbor Freight Tools


Liquid Rubber Sealant

This easy-to-use FLEX SEAL® black rubber spray is an ideal way to coat, seal, and stop leaks fast

Compare to
FLEX SEAL FSR20 at $0 Save 0%

+ Add to My List

Check Inventory For This Product At a Store Near You

FLEX SEAL® black rubber spray coating sprays out as a liquid, seeps into cracks and holes and dries to a watertight, flexible coating that lasts for years. It’s the easy way to coat, seal, and stop leaks fast.

  • Easy-to-use, portable, aerosol spray
  • Sprays out as a liquid and dries as a strong, rubberized coating
  • Stays flexible and pliable
  • Won’t sag or drip in summer heat
  • Doesn’t crack or peel in winter cold
  • Stops vibrations and deadens noise
  • Protects surface from corrosion
  • Can be used on wet or dry surfaces
  • Can be painted any of our 12 available colors once completely dry

Coat, seal, stops leaks
Container size
14 oz.
Shipping Weight
1.15 lb.
Note: Specifications are approximate and subject to change

We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.