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Crack Fillers & Repair Mortars

Repair materials that make systems last longer used to rebuild, patch, and prep substrates before coatings or membranes.

Patch & Repair

Substrate Prep

Crack Filling

Leveling

Patch & Repair

Substrate Prep

Crack Filling

Leveling

Where It Fits

Primer Use

  • Best when: Installed before primer in most systems. Crack fillers and repair mortars are used to address substrate defects before applying primers and coating systems.
  • Watch out: Ensure repair materials are fully cured and compatible with the primer system. Some primers may not bond well to certain repair mortar chemistries.

Build and Body Coat Use

  • Best when: Used to rebuild and level before system coats. Repair mortars rebuild spalled areas, fill voids, and create a uniform surface profile for coating application.
  • Watch out: Depth and width of repairs affect cure time and shrinkage. Follow manufacturer specifications for maximum lift thickness and cure times before overcoating.

Topcoat Use

  • Best when: N/A. Crack fillers and repair mortars are substrate preparation materials, not decorative or protective finish layers.
  • Watch out: These materials must be covered by appropriate primers and coating systems. They are not designed to be left exposed as a final surface.

Common Applications

Crack fillers and repair mortars prepare substrates for coating and waterproofing systems.

Industrial Floor Prep

Waterproofing Detail Prep

Court Resurfacing Prep

Joint and Crack Repair

Selection Checklist

Key questions to answer before selecting crack fillers and repair mortars.

Moving cracks to Static cracks

Moving cracks require flexible repair materials or stress relief strategies. Static cracks can use rigid repair mortars. Identify crack type before selecting repair method.

Depth and width

Repair depth and width dictate material selection and application method. Deep repairs may require staged lifts; wide cracks may need backer rod or specialized fillers.

Return to service time

Fast cure repair mortars are available for tight schedules. Standard cementitious repairs may require 24-48 hours before priming. Match material to timeline.

Indoor and Outdoor

Outdoor repairs must withstand weathering, UV, and thermal cycling. Indoor repairs may prioritize low odor or fast cure properties for occupied spaces.