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Watco Floor Joint Sealant

For filling construction joints, expansion joints and cracks

  • Two part, easy pour polysulphide solution
  • Use in heavy traffic areas
  • Resists chemical spills
  • Use Watco Back up Rod for deep joints
Frequently bought together


A two part, pourable grade, flexible joint sealant, based on the latest polyurethane technology. Great for filling construction joints, expansion joints and cracks.

Recommended areas of use

  • Ideal for construction joints between concrete slabs, factory and warehouse floors, car parks, garages, petrol station forecourts, etc.


  • Excellent compression and recovery
  • Protects floor joints and slab edges
  • Suitable for filling and sealing moving and non-moving joints in concrete floors
  • Accomodates +15% movement about the joint


Suitable for Concrete
Surfaces Filling and sealing moving and non moving joints in concrete floors.
Interior or Exterior Interior and exterior
Primer required Yes.
Composition 2 part polyurethane
Coverage 12m x 15mm wide x 10mm deep joint
Curing time 8 hours at 20°C
Minimum application temperature 15°C


Surface preparation

Joint sides should be clean and dry. Spalled joints should be repaired initially using Watco Concrex. For best results use Watco Back Up Rod to reduce deeper joints to the desired depth. Apply primer by brush to the sides of the joint and allow to dry (approx 30 minutes at 20ºC).


It is important that the two components are very thoroughly mixed together. Poorly mixed product will not cure correctly. Empty the contents of the smaller tin into the larger tin and mix thoroughly for approximately 3 minutes using a wide bladed tool such as a palette knife. Alternatively use a slow speed electric drill and paddle. Immediately decant the mixed components into an empty container, ideally a jug (plastic or metal) or can with a pouring spout. This will assist when pouring the product into the floor joint. Take care to ensure that all the contents are scraped off the sides and bottom of the tins. Mix again for one minute. If a pouring jug is not available, crimp the rim of the empty can to help with pouring.


Pour evenly into the prepared joint, leaving the top of the joint sealant just below the surface of the floor. If required, finish off with a flat blade or knife to remove air bubbles and then remove any masking tape before the sealant has set, drawing the tape across the sealant face so that any excess sealant falls into the joint and not alongside it.

Watco Floor Joint Sealant will adhere to clean concrete, sand/cement screed, polymer cement, epoxy and other resin toppings and nosings and most other common floor materials. It will also adhere to steel and other non-porous materials, but Watco's advice should be sought in the case of plastic materials and bituminous surfaces.

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€80.42 (Ex VAT)

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Tools and accessories

Watco Back Up Rod

Watco Back Up Rod

Cost effective packer for deep expansion joints

From €8.80  (Ex VAT)

Masking Tape

Masking Tape

A low tack masking tape for neat edges on smooth surfaces

€4.04  (Ex VAT)

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Watco Floor Joint Sealant

Watco Floor Joint Sealant

For filling construction joints, expansion joints and cracks

€80.42  (Ex VAT)