Skip to content
Shop Gifts for the tile installer in your life
Shop Gifts for the tile installer in your life
Two tubes of wedi620 sealant on a white background

wedi 620 Sealant

SKU US5000088
by wedi
$33.43 - $33.43
$33.43
$33.43 - $33.43
$33.43

wedi 620 – High-Performance Polymer Sealant (10.5 oz)

wedi 620 is a premium single-component, ready-to-use polymer adhesive and sealant engineered for advanced waterproofing and vapor barrier protection in wet-area tile assemblies. It’s the go-to companion for wedi Vapor 85 panels, wedi sealing tapes, corners, and membranes—delivering watertight and flexible performance in high-moisture environments like showers, steam rooms, and bathroom walls.

Features & Benefits

  • One-Step Waterproof Adhesive & Sealant
    Bonds and seals in a single application—eliminating the need for additional tapes at seams.
  • Flexible SMP Technology
    Maintains elasticity to absorb structural movement and prevent cracking or water intrusion.
  • Steam Shower & Vapor Room Rated
    Recommended for use with wedi Vapor 85 boards and Subliner Dry waterproofing systems for full vapor-proof construction.
  • Multi-Surface Compatibility
    Adheres to wedi panels, foam core benches, sealing corners, sealing gaiters, Subliner Dry, and a wide range of tiles.
  • Safe & Odor-Free
    Solvent-free, isocyanate-free, PVC-free, and odorless. Cures via moisture for safe use in indoor environments.

Technical Specifications

Property Value
Volume 10.5 oz cartridge
Base Material Silyl Modified Polymer (SMP)
Application Temperature 41°F to 95°F (5°C to 35°C)
Temperature Resistance -40°F to 250°F
Cure Time Skin forms in ~20 minutes
Curing Type Moisture cure, neutral and odorless
Flexibility Permanently flexible after curing
Waterproof Yes
Color Light grey
VOC Content Low (solvent-free)
Indoor Use Yes – steam showers, bathrooms, etc.

Common Uses

  • Sealing wedi Vapor 85 board seams

  • Bonding Subliner Dry to wedi panels

  • Waterproofing joints and edges in steam showers

  • Sealing foam benches, niches, and curb assemblies

  • Use behind tile in residential and commercial wet areas

Installation Tips

  • Apply directly to clean, dry wedi surfaces

  • Tool the sealant within 15–20 minutes for a smooth finish

  • Allow proper curing time before tiling (varies with humidity)

  • For deep seams or heavy-duty waterproofing, consider backer rod beneath sealant line

More Details

wedi 620 sealant is a high-performance, moisture-curing polymer sealant formulated to bond and waterproof wedi building panels, Vapor 85 steam-rated boards, and other wedi system components. This 10.5 oz ready-to-use cartridge is ideal for professional tile installers and DIY remodelers alike, delivering durable adhesion and flexible sealing performance without the need for solvent-based chemicals or additional waterproofing tape reinforcement.

Engineered with Silyl Modified Polymer (SMP) chemistry, wedi 620 offers high green strength and excellent adhesion in wet, humid, and alkaline environments. It’s an essential component when working with wedi Subliner Dry membranes, sealing tapes, pre-formed corners, and sealing collars in steam showers, barrier-free bathrooms, and wet area tile surrounds. The spreadable texture ensures smooth application and superior surface coverage across wedi products and tiled substrates.

Unlike typical caulks, wedi 620 sealant remains permanently flexible, absorbing stress from thermal expansion, structural movement, and substrate vibrations—reducing long-term risk of cracks, mold intrusion, and waterproofing failure. It supports a wide range of tile types including ceramic, porcelain, natural stone, cement, granite, and marble, and can even bond to waterproof foam, concrete backers, and existing wedi board assemblies.

Whether you’re sealing a steam shower niche or waterproofing behind mosaic tile in a luxury bathroom, wedi 620 delivers consistent, reliable, and professional-grade results.

Manufacturer

Let customers speak for us

from 478 reviews
Tavy spacers

I've been using these spaces for years. I love them. I'm just a little nervous because they changed the color of the spacers. I think they were bought out so I'm not sure if they're going to be the exact same size. They changed The colors the white ones are now 1/16 instead of green they switched all the colors around. I'm glad I have all my old ones

P.S.
Tavy 2-Sided Tile Spacers
Tavy 2-Sided Tile Spacers
Well made and lots better then some other products that I had used in the past

Well made and lots better then some other products that I had used in the past.

E.
FloFx NoFlo™ Waterproof Membrane
FloFx NoFlo™ Waterproof Membrane
Game changer

total game changer. Will purchase again.

W.
Built With Foam Shim Refills
Built With Foam Shim Refills
Great resource

Good products and an easy to use site make this a great option for tiling projects.

P.J.
TileTools
Great drain, even better system

This is a simple way to finish out your shower with a nice looking upgraded style drain.

P.J.
FloFX Drain Grates
FloFX Drain Grates

Like this product

M.L.W.
Russo Trading Company Spin Doctor Tile Leveling System 1/32″ Base
Russo Trading Company Spin Doctor Tile Leveling System 1/32″ Base

I like it

h.t.
Sigma KERA-CUT EXT Thin Panel Tile Cutter
Sigma KERA-CUT EXT Thin Panel Tile Cutter
Awesome!

The product worked great!. The effort to break off is much less than the previous product I was using from the orange store. These may cost a little more up front, but the ease of removal is worth it as I had a number of the previous products break off in between the tiles. And that can be a challenge to remove without damaging a tile edge. No doubt will purchase these again.

t.
Perfect Level Master T-Lock - Professional Anti Lippage Tile Leveling System 1/8" (3mm)
Perfect Level Master T-Lock - Professional Anti Lippage Tile Leveling System 1/8" (3mm)
I haven't used this awesome mixer yet but I

I haven't used this awesome mixer yet but I can't wait! I could not believe how fastit arrived on my door step too! Awesome company and I'll definitely be ordering from you guys again! 🙂 👍🏼

J.M.
Bucket Mortar Mixer
Bucket Mortar Mixer
Well done!

The ordering process was very simple and easy. I received a tracking number and the shipment arrived in great condition. I have no reservation with ordering again from Tile Tool.

t.
TileTools
like the effect of grout spacing with large format tiles

like the effect of grout spacing with large format tiles, plus reusable.

Anonymous
Russo Trading Company Bulk Horseshoe Tile Spacers
Russo Trading Company Bulk Horseshoe Tile Spacers
Outstanding Product

I have used the orange store brand and some clips were difficult to break and some remained between the tiles which can be a challenge to remove. With the perfect Level Master product, not one single issue. It takes much less force to break the spacer clip also. I will purchase this brand again without question. Good quality product and easy removal.

t.
Perfect Level Master Wedges For Tile Leveling Spacer
Perfect Level Master Wedges For Tile Leveling Spacer
Saves your arms and the life of your drill. A must if you dry packing. 10/10

Bucket Mortar Mixer

J.R.
Bucket Mortar Mixer
Bucket Mortar Mixer
Better than Dewalt and MK Diamond blades for cutting porcelain tile

Before finding the Helix Copperhead blade, I used Dewalt XP4 and MK Diamond MK-415 blades. Both of these blades generally have good reviews, but they cannot touch the Helix Copperhead for smoothness of cut, lack of chipping, and lack of breakout at the end of the cut. I use the Helix blade primarily on porcelain tile and the cuts look factory on rectified tile. My machine is a MK Diamond 10" wet saw with a belt-driven blade arbor. The only non-positive comment I will make concerns the thinness of the blade. It has a thickened center section, which helps the blade run true. However, because of the blade rim thinness, it is possible for the blade to deflect slightly if pushing the tile too fast - an effect that is easily remedied by slowing cutting speed.

E.
Helix Copperhead Diamond Blade
Helix Copperhead Diamond Blade
Made leveling walls so much easier and

Made leveling walls so much easier and faster

j.
Built With Foam Wall Flattening Shim Kit
Built With Foam Wall Flattening Shim Kit