MasterProtect FL 749: Acrylic copolymer block filler

Formerly: Thoro Block Filler


How does MasterProtect FL 749 work?

MasterProtect FL 749 is a ready-to-use, VOC compliant, 100% copolymer-based block filler resin used to prime and fill porous masonry before the application of MasterProtect coatings.

Recommended uses:

  • Substrates where absorbency is not uniform

What are the unique features of MasterProtect FL 749?

  • Heavy-bodied
  • Breathable
  • Moisture-resistant
  • Excellent workability
  • Moisture tolerant
  • Easy to apply
  • VOC compliant

What are the benefits of MasterProtect FL 749?

  • Fills pores; excellent surface closure
  • Allows substrate moisture vapor to escape from the structure; prevents peeling and blistering
  • Will not degrade in the presence of wet-dry cycles
  • Ease of application; lower labor cost
  • Can be applied to damp substrates
  • Can be sprayed with airless equipment
  • VOC compliant for EPA and most regional authorities

US / Canada Product Information

Data Guide

Data Guide (French)

Data Guide (Spanish)

Certification Letter

LEED Letter

Safety Data Sheets