Flex Seal Pro

Flex Seal Pro

Flügger Seal is an elastic sealant for sealing and filling of cracks, joints and corners.

Product Description

Elastic MS polymer sealant, indoor and outdoor. Paintable with extra strong adhesion and elasticity.
  • Extra elastic
  • Low emission
  • Extra strong adhesion


Used as a seal between construction components of concrete, lightweight concrete, plaster, plasterboard, gypsum fibreboard, wood, metal, glass and painted substrates.
The sealant should be sized so that the sealant’s movement falls below +/- 20%.


Must be clean, dry, firm and suitable for surface treatment.


Remove loose material and paint by cleaning and sanding.
Remove dirt, grime, grease and chalking materials by cleaning with Fluren 37.
Prime new or bare, cleaned wood with Interior Stop Primer.
Prime new or bare, cleaned wood with Wood Tex 01 Priming Oil.
Absorbent and porous substrates can be primed with Sealer.
Use the correct size/amount of joint sealant, joint depth = ½ joint width.
Narrow cracks and joints are best treated as square joints.


Filler gun.
Cut off the tip of the filler gun.
Cut the tip at an angle to adjust to <joint width.
Easily workable, press into place and smooth using a sealer squeegee or joint stick and water before the joint forms a skin.
Choose a tool based on the width of the joint.
Remove excess sealant mechanically.
Apply sealing tape if necessary and remove it immediately after application.
Cold/ heat can affect the viscosity of the material.
Avoid condensation forming.
Temperature and atmospheric humidity affects drying time, full curing and recoat interval.
Always perform a test treatment for a check and acceptance of adhesion and result.

Be Aware

Joints < 6 mm or > 30 mm do not absorb maximum joint movement.

Environmental information

Clean off the sealant from tools and wash them with white spirit. Bring remains of fluent sealant to the local recycling centre. Minimize your paint waste by pre-estimating how much paint you need. Keep the leftover paint for future use so you can effectively reduce the environmental impact.

Storage: Cool, frost free and tightly closed

Protection equipment: Painting: eye protection, gloves. Sanding: respiratory protection.

Technical Data

Plaster & Sealant
Density (kg/liter)
Weight %
Volume %
Temperature resistance Min. (° C)
Max. +90°C
Temperature resistance Min. (° C)
Min. -40°C
Max. humidity 80 % RH.
Dry to touch at 20°C, 60% RF (Hours)
Fully cured at 20c, 60% RF (Days)
Min. Joint width (mm)
Max. Joint width (mm)
Cleaning of Tools etc.
Remove uncured sealant with white spirit. Remove hardened sealant mechanically.
Supplementary Info
Low emission, meets requirements for CE marking, cf. EN 15651 and requirements for M1. Shelf life: 18 months in unopened container.

Current TDS Version

luty 2021

Replaces TDS Version

październik 2020