MasterProtect H 400 Concrete/Masonry Silane Sealer, 54G - MasterProtect H 400 (formerly Enviroseal® 40), clear, water-based, 40% silane  penetrating sealer / water repellant. For concrete and masonry. 54-Gallon Drum. Price/Drum. Special Order.
MasterProtect H 400 Concrete/Masonry Silane Sealer, 54G
$3,820.74 SALE $2,401.99
(Savings: $1,418.75)
 Buy 2 or more and pay $2,254.24 each (save 41.00%) 
  Order Options:  
  Add To Cart  
  Add To Saved Cart  


MasterProtect H 400 (formerly Enviroseal® 40), clear, water-based, 40% silane penetrating sealer / water repellant. For concrete and masonry. 54-Gallon Drum. Price/Drum. (5G size shown in photo)

Ordering Notes:

  • Special Order.
  • Shipping leadtime: 2-5 days.


MasterProtect H 400 is a clear, water-based, 40% silane  (alkylalkoxysilane) penetrating sealer with traffic bearing qualities. Provides long-lasting protection against moisture intrusion, freeze/thaw cycles, and chloride intrusion.


  • Water based, VOC compliant (Except S. Calif SCAQMD)
  • Excellent penetration
  • High moisture repellant
  • Breathable
  • Transparent, non-staining
  • One component
  • Ideal for traffic-bearing surfaces

Yield (typical):

  • Concrete: 100 – 200 ft2/gal (2.4 – 4.8 m2/L)
  • Brick: 100 – 200 ft2/gal (2.4 – 4.8 m2/L)
  • Always apply a test area to determine actual coverage rates. Coverage rates will vary greatly with the porosity of the substrate


  • Parking garages, Stadiums, Bridge decks, Concrete highway road surfaces, Ramps and barrier rails, Stadiums, Cooling towers, Many other reinforced concrete structures, Brick Pavers, Unglazed Tile, Chimneys, Hard Burnt Brick, Stucco.
  • Verify substrate has properly cured. Concrete should obtain 80% of design strength, typically achieved within 14 – 28 days.
  • Clean concrete surfaces of all sand, surface dust and dirt, oil, grease, chemical films and coatings and other contaminants prior to application. Use waterblast, sandblast, or shotblast as necessary to achieve the desired surface condition.
  • Surface, air, and material temperatures should be 40 to 110° F (4 to 43° C) during application. Do not apply Enviroseal® 40 when temperatures are expected to fall below 40° F (4° C) within 12 hours.
  • Surfaces to be treated can be slightly damp; however, a dry surface is suggested for maximum penetration of sealer. Do not apply Enviroseal® 40 if standing water is visible on the surface to be treated.
  • Crack control, caulking, patching, and expansion joint sealants can be installed before or after application of the sealer.
  • Allow a minimum of 6 – 12 hours curing time for caulking and sealant materials (or until they have skinned over) before applying Enviroseal® 40.


  • Horizontal and vertical
  • Exterior or interior
  • Above grade SUBSTRATE
  • Concrete substrates: architectural, glass-fiberreinforced, precast, cast in place, slicia fume
  • New and existing concrete


  • MasterProtect H 200 (Enviroseal 20)  20% silane, for food processing areas and more cost sensitive projects.
  • Enviroseal 7 for hard-burnt vertical brick and other dense surfaces.
  • Envirseal PBT for very porous vertical surfaces, such as split face block and lightweight concrete.


More Product Information:


Email us at or
Call us at 1-800-474-7570 or 602-272-8128
You'll get a prompt reply!

similar product terms: masterprotect, masterprotect h 400, 51672815, enviroseal-40, environseal, evioseal, eviron-seal, masonry sealer, masonry waterproofing, concrete waterproofing, concrete sealer, concrete sealers, concrete finish, concrete driveway sealer, cement sealer, stamped concrete sealer, wet look concrete sealer, clear concrete sealer, concrete water seal, concrete block sealer, penetrating concrete sealer

A CSG Group Company

Shop with
Peace of Mind!