Zinsser Grade 1 is a high-performance, breathable interior paint designed for use in traditional and historic buildings, including churches, castles and period properties. It combines the benefits of a primer, stain blocker and finish in a single can, with no need for washing down or additional priming.

Its unique zero-tension formula forms a vapour-permeable, dead-flat matt finish that prevents cracking and flaking caused by trapped moisture. It adheres to difficult substrates such as limewash, distemper, plaster and whitewash, offering long-lasting protection and excellent stain blocking on ceilings, walls, trims and cabinetry.

Grade 1 is ideal for use in sensitive or occupied spaces, with low odour application and quick drying. It contains a surface biocide to protect against fungal degradation and is suitable for surfaces with up to 12.5pH.

Why Use Zinsser Grade 1?

✅ Primer, stain blocker & finish coat in one
✅ Zero-tension formula – Ideal for lime plaster and historic materials
✅ Breathable coating – Prevents peeling and cracking over time
✅ Blocks water, smoke, soot & tannin stains
✅ Virtually odourless – Suitable for sensitive environments
✅ Multi-surface application – Masonry, plaster, render, cement and more

Preserve the character of traditional buildings without compromising on performance. Zinsser Grade 1 provides a durable, breathable finish that respects the fabric of older properties while delivering modern protection and versatility.

Surface Preparation

• Ensure surfaces are clean, dry and free from dust, grease, wax, or contamination.

• Remove any loose, flaking paint and excessive chalky material.

• Wash down surfaces with appropriate cleaning solution if unsure.

• Remove mould using Zinsser Mould Killer & Remover.

• Special care must be taken when preparing pre-1960s surfaces which may contain lead.

• Seal knots or sap streaks with Zinsser B-I-N Primer Sealer.

• Do not apply to surfaces subject to constant moisture, immersion or exterior exposure.

Technical Data

• Finish: Bright white, flat matt (tintable)

• Coverage: Approx. 10m² per litre @ 40 microns DFT

• Touch dry: 30 minutes

• Recoatable: 2 hours

• Full cure: 7 days

• Application methods: Brush, roller, pad, airless sprayer

• Spray tip: 0.017" @ 2200–2800 psi

• pH tolerance: Up to 12.5

• Substrate moisture: Max 12%

• Temperature range: 4°C to 32°C

• VOC: < 350g/l

• Solids (by volume): >55%

• Gloss (60° @ 7 days): <5

• Storage: Indoors, 4°C–27°C

• Shelf life: 2 years (unopened)

• Clean-up: White spirit

Directions for Use

• Stir thoroughly before use.

• Apply with a natural bristle brush, roller, pad or airless sprayer.

• Do not thin. Bring to room temperature before spraying.

• Apply at 4°C–32°C in RH up to 85%.

• Use on cured plaster, concrete, limewash, distemper, wood, PVC, glossy surfaces and more.

• Ideal for stained ceilings and walls – blocks smoke, water, nicotine and graffiti.

• Tintable to most BS4800, RAL and NCS colours.

• Clean tools immediately with white spirit.

Data Sheets

Zinsser Grade 1 - TDS

Zinsser Grade 1 - MSDS