Grain Bin Waterproofing & Repair

Grain Bin Waterproofing & Repair


Permanently bond, waterproof, and seal bin surfaces for about half the cost of silicone caulk!

Provides an industrial quality flexible base seal which permanently bonds to and seals all grain bin surfaces yet expands and contracts with temperature changes & fill cycles. Endorsed by the world’s largest grain bin manufacturers including Brock/Butler for their new commercial bins.

  • Do-It-Yourself! Simply Brush or roll on SANI-TRED products for a flexible, durable, watertight seal!
  • Liquid rubber base that stretches with the bins as they move!
  • Stays flexible and will not harden, crack or dry out in the sun!
  • Cures to any thickness to fill cracks in floors, walls, and roofs!
  • Cures quickly to a tack-free finish that is great for grain storage!
  • Exterior or interior installation!
  • Dramatically increases the efficiency of grain drying bins!
  • SANI-TRED stops rust and eliminates further steel base corrosion!
  • No attraction for insects or vermin to feed on!

SANI-TRED seals grain hoppers by providing a permanent waterproof exterior rubber coating which eliminates future rusting and protects valuable seed grains. This system may be applied inside or outside of the hoppers!



SANI-TRED was use to seal the World’s Largest Grain Bin 200′ Wide, Shown Here in Cambridge, Wis.

Step by Step Grain Bin Waterproofing & Repair:

The following steps will show you How to Waterproof a grain bin with Sani-Tred.

Products Needed: PermaFlex, LRB (Liquid Rubber Base) and TAV (Thickening Activator)

1. The first thing you would do is prepare the substrate. Remove any loose deteriorated substrate, make sure the substrate is clean, dry, free of any previous applied products, and foreign matter.

If the grain bin has a previous applied product on the exterior that likely cannot be removed, one can either apply Sani-Tred products on the interior of the bin or over the existing material with the LRB/TAV at greater thickness (bridging beyond the existing material).

The photo below shows the galvanized steel & concrete after it has been sand blasted in order to remove a previous applied products.


Sand Blasted

2. Prime approx 3″-6″ out onto the slab and approx 3″-6″ up onto the bin using 1 coat of PermaFlex (240 sq ft per gal).

(3.14 x diameter of grain bin) / 240 = gallons of PermaFlex needed.




3. Apply a 1-1/4″ diameter caulk bead of LRB/TAV mixture (Liquid Rubber Base, Thickening Activator) where the bin meets the slab. 2-parts LRB is mixed with 1-part TAV to create the thickest mixture possible (approx the same viscosity as silicone caulk).

3.14xdiameter of grain bin = circumference
LRB/TAV “Round “Caulk Bead Chart

Grainbin-Patched-LRB-TAVPatched LRB/TAV


Fully Patched


4. Topcoat using 1 coat of PermaFlex (240 sq ft per gal).
(3.14 x diameter of grain bin) / 240 = gallons of PermaFlex needed.


Top Coat Permaflex


Fully Waterproofed

Sanitred Products has high volume spray application for those large jobs, too-large to apply by hand!sanitred-order-now