Masking Liquid H20
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Associated Paint Masking Liquid H2O – Liquid Masking for Window & Door Glass
Masking Liquid H2O (80-400) is a clear, water-based liquid masking coating for painting French doors, windows and other glass-filled woodwork, with no tape and no scraping. Brush it over the glass and onto the muntins, paint your trim, then lift the edge with a dull knife and peel the film off the glass. On the wood it stays put and works as a primer and sealer under your paint.
Key Features
- No taping or razor scraping on multi-pane doors and windows.
- Peels cleanly off glass in sheets.
- Doubles as a primer/sealer on wood and porous surfaces.
- Brush, roll or spray.
- Low VOC (under 100 g/L), soap-and-water clean-up.
Where to Use It
Interior windows, French doors, cabinet doors with glass and other glazed woodwork, over wood, vinyl, aluminum and properly prepared painted surfaces. Interior use only. Not for stained, frosted, etched, tinted, coated, textured or plastic glass (Plexiglas). Not for bare wood you plan to stain. Don't use lacquers or strong-solvent coatings over it.
Sizes
946 mL (about 100 sq ft) and 3.78 L (up to 400 sq ft, or about 3,000 linear feet of a 1" stripe).
Masking Liquid or Painter's Tape?
Masking Liquid wins on glass-heavy doors and windows, where taping every pane takes hours. For straight lines on walls, trim and ceilings, use FrogTape Pro Grade.
Specs & Coverage
- 3.78 L: up to 400 sq ft at 6 mils wet / 3 mils dry, or about 3,000 linear ft of a 1" band
- 946 mL: about 100 sq ft, or 750 linear ft
| Type | Water-based, acrylic-modified clear coating |
| Finish | Clear, medium lustre |
| Dry to touch | 1 hour (25 °C, 50% RH) |
| Topcoat | Latex/acrylic after 4 hours. Alkyd after 12 hours |
| Remove from glass | Within 30 days, sooner in strong sun or big temperature swings |
| Application temperature | 10–32 °C (50–90 °F) |
| Application | Nylon brush, 1" nap lambskin roller, or airless/HVLP (0.017 tip, low pressure) |
| Thinning | Not for brushing. For spraying, 1 pint of water per 3.78 L |
| VOC / solids | Under 100 g/L / 46% by volume |
| Clean-up | Warm soapy water. Flush spray equipment with mineral spirits |
Application Guide
- Clean the glass and frames. Wood should be bare or properly prepared paint.
- Apply a generous coat over the glass, overlapping onto the wood muntins and frame. A 1" brush or lambskin roller works well.
- Let it dry about 1 hour, until clear and dry to the touch.
- Paint the wood with latex or acrylic after 4 hours, or alkyd after 12. Paint right over the masked glass edges.
- Once your paint is dry, run a dull knife along the glass edge to lift the film.
- Peel the film off the glass by hand. If it's stubborn, dampen it with a wet sponge. In the cold, warm it with a heat gun on low.
- Remove within 30 days.
FAQ
1How does masking liquid work on windows?
You coat the glass and let the film overlap onto the wood. Paint the frame, lift the film at the glass edge with a dull knife, and it peels away with any paint on it. The film on the wood stays as a primer.
2How long can I leave it on the glass?
Up to 30 days. Remove it sooner if the glass gets strong sun or big temperature swings, which make it harder to peel.
3Can I use it on exterior windows?
Associated Paint lists Masking Liquid H2O for interior use. For exterior frames, use tape or contact us for advice.
4What glass shouldn't I use it on?
Only use it on regular clear glass. Avoid stained, frosted, etched, tinted, coated or textured glass and plastic like Plexiglas.
5What paint can I use over it?
Latex, acrylic and vinyl acrylic after 4 hours, or alkyd after 12 hours. Don't use lacquers, stains or strong-solvent coatings.
6How much do I need?
A 946 mL covers about 100 sq ft. That's enough for several multi-pane doors or a run of windows. The 3.78 L covers up to 400 sq ft for whole-house trim jobs.
7It won't peel. What should I do?
Lift a corner with a dull knife along the glass edge. Dampen stubborn spots with a wet sponge, and warm it with a heat gun on low if it's cold.
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Canada Shipping
- Enjoy free shipping to Ontario and Quebec on orders over $249.
- Orders over $249 qualify for free shipping to all other provinces.
- Returns accepted within 35 days from the date of delivery.
- Custom tinted paints are classified as Final Sale items and are not eligible for return or store credit.