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    ​​Primers, Patching Compounds, and Block Fillers

    To be used with MasterProtect wall coatings

    Primers, patching compounds and blockfillers can be used on a variety of substrates including stucco, brick and concrete.  The excellent workability properties of these chemicals can result in significant labor savings.

    • Modified acrylic primers for use with high-build coatings
    • Acrylic patching compounds used with stucco, brick, and concrete substrates. Great for use in damp and humid climates.
    • Acrylic based block filler used to primer and fill porous masonry

    Primers, Patching Compounds and Block Filling Products

    Block Filler

    MasterProtect FL 749

    Provides excellent surface closure while allowing moisture vapor to escape from the substrate | Product can be applied to damp substrates and has excellent workability

    Patching Compounds

    MasterProtect FL 746 and FL 748

    Knife grade, textured | 100% acrylic crack bridging material | Fills voids in vertical substrates


    MasterProtect P 200

    White-pigmented acrylic copolymer primer | Perfect for chalky surfaces | Cool weather application

    MasterProtect P 100

    Modified acrylic primer that consolidates weak, dusting substrates for improved adhesion and durability of MasterProtect acrylic coatings.

    MasterProtect P 150

    A tintable, modified acrylic primer to seal substrate and improved adhesion and workability of acrylic coatings.

    Primers, Patching Compounds and Block Fillers

    Direct contact

    Master Builders Solutions Technical Support

    Construction Systems