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Pro-Spec Flexi Fill Gap Filler 475g

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Availability: In stock


RRP: $3.94

Save: $0.56
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Quick Overview

Pro-Spec Flexi Fill Gap Filler is a flexible, durable, paintable water based gap filler. It has good wather resistance allows Pro-Spec Flexi Fill to be used for interior and exterior applications.

Pro-Spec Flexi Fill Gap Filler is sag resistant and will not stain building materials.

This product is paintable. It can be overpainted with oil or water-based paints after the surface has firmly skinned (approximately two hours after application). Wide joints are best left for 48 hours before painting as shrinking during drying can cause the paint to crack, allowing the sealant beneath to show through.

Pro-Spec Flexi Fill Gap Filler is capable of joint movement of +/- 10% of joint width. Ideal for use where slight joint movement occurs and where conventional fillers will crack and fall out.


Materials this product is suitable for

  • Wood
  • Plaster
  • Brick
  • Masonry
  • Fibre cement sheeting
  • Painted surfaces
  • Glass
  • Ceramic tiles
  • Aluminium

How to use product

  • Ensure surfaces are clean, dry and totally free of oil, soap, grease, dust, old sealants, release agents and loose material. Remove soap residue from tiles.
  • Apply masking tape to either side of the joint where the contact with sealant is not required to get clean straight edges.
  • Cut blind seal of Pro-Spec Flexi Fill Gap Filler cartridge and fit nozzle.
  • Trim end on nozzle to obtain correct bead width and use with standard cartridge gun.
  • Dispense with steady trigger pressure.
  • Hold cartridge gun at a 45° angle, extruding sealant into gap ahead of nozzle.
  • Smooth off sealant  using a wet putty knife or finger.
  • Then peel off masking tape after joint is filled.
  • Once cured, trim with a sharpe knife.
  • Clean tools with water before sealant dries.
  • Will cure fully within 24hrs
  • Allow sealant to skin for approximately 30mins before painting. For large gaps, allow 48hrs.


Paints that shrink during drying may crack e.g. some water based undercoats and flat paints. To test, paint a small section of sealant. The likehood of paint cracking may be reduced by

  1. Painting the sealant with vinyl/acrylic semi-gloss or oil-based undercoat and/or
  2. Allowing the sealant to cure thoroughly before painting.
  3. Paint exterior applications with a suitable paint to increase durability.


Not recommended for

  • Gaps that have a width wider than 25mm, or a depth wider than 12mm.
  • Where significant joint movement occurs, such as gaps between tongue and groove boards or weatherboard overlaps
  • Sealing around bathtubs, kitchen sinks and in shower recesses. 
  • Areas of continuous water immersion or in constantly damp areas
  • Being applied at temperatures below 5ºC
  • Applications where joint movement is in excess of +/- 10% of joint width. 
  • Use on trafficable joints


15 metres of a 5mm diameter bead

Additional Information

SKU 400663
Type No
Brand Pro-spec

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