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Screen Printing Class

Screen Blockout

Screen printing blockout is used to seal pinholes, repair stencil imperfections, and block unwanted open mesh before or during production. Whether you're touching up a newly exposed screen or making quick press-side repairs, blockout helps produce clean, professional prints while reducing wasted garments and production downtime.


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Blockout Pen - Green
Price: $11.99
Availability: Stock
Item #: 28BLKOUTPENG -

    Pinholes are a common challenge in the screen-making process, but our Blockout Pen (Green) offers a fast, effective solution. Specially designed for screen printers, this high-performance blockout pen quickly fills pinholes and blocks out unwanted open areas on your screen with ease. The Blockout Pen (Green) features an ultra-fast drying time of just 30 to 90 seconds, allowing you to continue printing without long delays. Its water-soluble formula makes cleanup simple, reclaiming easily with...

    Blue  Blockout
    Price: $40.00
    Availability: Stock
    Atlas Screen Supply Company Item #: 25UB5 -

      Touch up your emulsion with Blue Blockout. Blue Blockout is for use with all types of films and emulsions. Not for use with water based inks.Use with plastisol or solvent based inksApplies evenlyQuick drying

      Blue Blockout (Quart)
      Price: $17.80
      Availability: Stock
      Atlas Screen Supply Company Item #: 25UB2 -

        Touch up your emulsion with Blue Blockout. Blue Blockout is for use with all types of films and emulsions. Not for use with water based inks.Use with plastisol or solvent based inksApplies evenlyQuick drying

        Kiwo Hardener HP (Gallon)
        Price: $48.56
        Availability: Stock
        Kiwo Item #: 37HARDENERHP5 -

          HARDENER HP (Reclaimable) is a chemical hardener used to increase the water resistance of water resistant emulsions.  Unlike other stencil hardeners, HARDENER HP will not result in an un-reclaimable stencil, although it may require slight longer time to reclaim. HARDENER HP can be used on all emulsions but works best for the purpose of enhancing the water resistance of emulsions formulated for good water resistance. Results may vary when using stencil hardeners in conjunction...

          Kiwo Hardener HP (Quart)
          Price: $17.25
          Availability: Stock
          Kiwo Item #: 37HARDENERHP2 -

            HARDENER HP (Reclaimable) is a chemical hardener used to increase the water resistance of water resistant emulsions.  Unlike other stencil hardeners, HARDENER HP will not result in an un-reclaimable stencil, although it may require slight longer time to reclaim. HARDENER HP can be used on all emulsions but works best for the purpose of enhancing the water resistance of emulsions formulated for good water resistance. Results may vary when using stencil hardeners in conjunction...

            Learn More About Screen Printing Blockout

            What Is Screen Printing Blockout?

            Screen printing blockout is a water-resistant coating used to seal unwanted open mesh areas on a screen. It is commonly applied after exposure to repair pinholes, cover small stencil defects (pinholes), and prevent ink from printing outside the intended image area.

            When Is Blockout Used?

            Blockout is typically applied after the screen has been exposed and washed out. Printers use it to correct small imperfections before production begins or to make quick repairs during a print run without having to remake the screen.

            • Seal pinholes
            • Repair damaged stencil edges
            • Block unwanted open mesh
            • Prevent ink leaks during printing
            • Extend the usable life of a stencil

            How Is Blockout Different from Emulsion?

            Although blockout shares many characteristics with screen printing emulsion, its purpose is different. Emulsion is used to create the stencil during screen exposure, while blockout is used afterward to repair and seal areas that should not print. Both products become water resistant after drying, making blockout an ideal solution for quick stencil corrections.

            Choosing the Right Blockout

            Most blockout products are designed to dry quickly, resist plastisol and water-based inks, and wash away during the reclaiming process. Selecting the right blockout depends on your ink system, reclaiming process, and production requirements.