UGL® EcoLok® Primer Sealer

UGL® EcoLok® Primer Sealer

UGL® EcoLok® Primer Sealer is a multi-surface, environmentally-friendly, stain-blocking primer/sealer for use on interior and exterior wood, composite deck products, T-111, vinyl, PVC plastic, tile, clear polyurethane finishes, masonry, fiber cement, ceiling tiles, textured hardboard, sheetrock, cement board, glossy painted surfaces, chalking paint, and properly prepared galvanized steel. The high-hide formula prevents bleed-through into the finish coat on wood species that contain tannin, like redwood, cedar and fir. If you’re priming over deep or bold colors, this product is the perfect choice. It also primes and seals most interior household stains, mineral stains, rust stains, watermarks, crayon, ink, pencil, and handprints.

UGL® EcoLok® Primer Sealer Application
Certified By Green Wise

Quick Overview

Product Features:

  • Interior and exterior
  • A special biocide additive inhibits mold and mildew growth on the dried primer film
  • Green Wise® Certified
  • Non-flammable
  • Sizes: gallon
  • Coverage: on smooth surfaces up to 400 square feet per gallon – on rough surfaces, up to 300 square feet per gallon
  • Dry time: 30 minutes to touch
  • Recoat: 1 hour


  • Ceiling tiles
  • Wood
  • Composite decking
  • T-111
  • Vinyl
  • PVC plastic
  • Tile
  • Masonry
  • Textured hardboard
  • Galvanized steel



The surface must be clean, dry and free of all loose dirt, dust, wax, mildew, scaling material, and flaking paint.* Sand glossy surfaces to improve adhesion. Replace loose, cracked or warped boards and repair any damaged areas. Unpainted exterior wood exposed to sun and weather for longer than 2 weeks must be cleaned and sanded prior to priming. On wood species that contain high levels of tannin, like redwood, cedar and fir, 2 coats may be necessary. All mold and mildew must be cleaned with a solution containing one-third-cup heavy-duty laundry detergent, 1 quart household bleach and 3 quarts of warm water. Apply with a scrub brush. Rinse thoroughly and allow it to dry before applying the primer. Do not apply product to bare masonry surfaces subjected to hydrostatic water pressure.

Previously Painted or Stained Wood
Clean previously painted surfaces thoroughly. Remove all loose or flaking paint by scraping. Sand glossy paint surfaces to improve adhesion. Spot-prime areas where the previous coating has peeled or worn away, then prime the entire surface.

Mineral Staining on Previously Painted Surfaces
Mineral staining is caused by naturally-occurring minerals present in the masonry. To control mineral stains that have bled through a surface painted with masonry waterproofer, apply 1 coat of UGL® EcoLok® Primer Sealer over the existing masonry coating. For a uniform appearance, topcoat with an additional coat of a masonry waterproofing paint.


Apply when air and surface temperatures are above 50°F. Apply straight from the can. DO NOT THIN. Apply by brush, roller, or spray. Do not apply to horizontal surfaces if rain is expected within 24 hours. Avoid applying in direct sunlight. Maintain a wet edge to avoid lap marks. If spraying, reduce UGL® EcoLok® Primer Sealer up to 10 percent with clean water. Topcoat with ZAR® Solid Color Deck & Siding Stain or another quality latex or oil-based paint or stain. Heavy stains may require an additional coat.

USAGE STATEMENT: Prior to use, carefully read the product label and follow the directions. For technical information, warnings, cautions, notices, and additional information, download and read the documentation available on this website.

* WARNING: If you scrape, sand or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or visit