Sealers Primers Undercoats
Sealers Primers Undercoats — The Foundation of a Lasting Finish
A great topcoat is only as good as the system beneath it. Paintworld’s Sealers Primers Undercoats range covers adhesion, stain blocking, moisture resistance and corrosion control, so your finish goes on smoother and lasts longer. From problem-solving primers for kitchens and bathrooms to anti-corrosive metal systems and specialist wallcovering prep, you’ll find the right base coat here for a professional result.
Shop the Sealers, Primers & Undercoats Range
Match the product to the surface and the problem you’re solving.
- Zinsser Smart Prime — Advanced water-based primer with the coverage and stain-blocking performance you want for tricky substrates and colour changes.
- Zinsser PERMA-WHITE — Durable, mould-resistant interior coating system for wet and high-humidity areas; ideal for bathrooms, laundries and kitchens.
- Zinsser PERMA-WHITE (Mould & Mildew Resistant) Eggshell — Low-sheen, washable interior finish designed for ongoing mould resistance in moisture-prone rooms.
- Zinsser Bulls Eye 1-2-3 Grey — Versatile water-based primer-sealer that promotes adhesion on glossy or hard-to-paint surfaces; grey tint helps under deep or bright topcoat colours.
- Shieldz Universal Wallcover Primer — Purpose-made primer for wallpaper and wallcoverings; seals porous substrates and creates a uniform surface for application and future removal.
- Weatherfast Pri-Coat — Reliable primer/undercoat step for exterior projects where fast turnaround and weatherable performance matter.
- Shipshape Primer Undercoat — High-build, sandable undercoat that helps you achieve a level, uniform base on timber and prepared metal before topcoating.
- NoRust All Surface Primer — All-round metal primer solution that promotes adhesion and helps resist rust on properly prepared steel and iron.
- NorShield Anti-Corrosive Primer — Anti-corrosive build for steel in exposed conditions; a dependable start to metal systems where longevity is the priority.
Always follow label directions for preparation, application and recoat windows.
Why Choose Paintworld for Sealers Primers Undercoats?
- Problem-solving selection — From stain blockers and adhesion primers to anti-corrosive metal systems and wallcovering prep.
- Trade-trusted brands — A curated mix that pros rely on for consistent coverage and predictable recoat times.
- Project matching — Advice to pair your sealer/primer/undercoat with the correct topcoat for your substrate and environment.
- Fast fulfilment — Order online for delivery or click & collect.
How to Choose the Right Sealer, Primer or Undercoat
By Surface/Area
- Bathrooms, laundries, kitchens: Choose PERMA-WHITE for a mould-resistant interior system; use compatible primers where needed for problem areas.
- Glossy, previously painted or hard-to-coat surfaces: Bulls Eye 1-2-3 Grey promotes adhesion and helps with strong colour changes.
- Stained, marked or discoloured substrates: Consider a stain-blocking primer (e.g., Smart Prime) before your undercoat and topcoat.
- Wallcoverings: Shieldz Universal Wallcover Primer creates a uniform, sealed surface that aids both application and future removal.
- Exterior timber/trim: Weatherfast Pri-Coat or Shipshape Primer Undercoat to build a smooth, even base before finishing coats.
- Bare steel and iron: Start with NoRust All Surface Primer or NorShield Anti-Corrosive Primer on properly prepared metal.
By Task
- Adhesion: Look for “adhesion primer” or multi-surface primer claims.
- Moisture & mould resistance: Use moisture-tolerant primers and mould-resistant interior systems in wet zones.
- Corrosion control: Use anti-corrosive primers on prepared steel; remove rust scale and contaminants first.
- Colour change: A grey undercoat can reduce coats when moving to deep or vivid colours.
Pro Tips for a Better Base
- Prep is everything: Clean, de-gloss or sand as directed; stubborn areas may need a liquid de-glosser or degreaser before priming.
- Respect recoat times: Primer must dry/cure as specified for maximum adhesion and stain blocking.
- Spot prime first: Hit stains, patched areas and repairs before a full prime to avoid telegraphing.
- Mind the climate: Temperature and humidity affect open time, penetration and recoat windows—plan accordingly.
- System thinking: Pair your primer/undercoat with a compatible topcoat (interior, exterior, enamel, acrylic) for best results.
FAQs — Sealers Primers Undercoats
Q1. Do I always need both a primer and an undercoat?
A. Not always. Some products act as a primer-undercoat in one, while others are specialised. Use a sealer/primer to address adhesion or stains, then an undercoat to build a smooth, uniform base when the specification calls for it.
Q2. When should I choose a grey undercoat instead of white?
A. A grey undercoat (e.g., Bulls Eye 1-2-3 Grey) can reduce the number of finish coats when applying deep or bright colours, helping achieve truer colour coverage faster.
Q3. What’s best for bathrooms and laundries?
A. Look for mould-resistant interior systems designed for humid environments (e.g., PERMA-WHITE), and address any stains or adhesion issues with a suitable primer first.
Q4. Can I paint straight over old gloss?
A. Clean thoroughly and de-gloss mechanically or with the recommended prep product, then apply an adhesion primer before undercoating and topcoating.
Q5. How do I handle water stains or smoke marks?
A. Spot prime with a stain-blocking primer (e.g., Smart Prime) and allow full dry before priming the broader area as required.
Q6. Which primer should I use on bare steel?
A. After surface preparation, choose NoRust All Surface Primer or NorShield Anti-Corrosive Primer as the first step in your metal system.
Q7. Do I need a special primer before wallpapering?
A. Yes—Shieldz Universal Wallcover Primer is formulated to seal and create a uniform key for wallcoverings, and to aid future removal.
Q8. What’s the benefit of a “primer-undercoat” product?
A. It can save steps on suitable substrates by providing both bond and a smooth, sandable base—always check the label to confirm suitability for your surface and topcoat.
Q9. Can I use exterior primers indoors and vice versa?
A. Some are dual-purpose, others are not. Always follow the label—indoor air quality, odour and cure chemistry may differ from exterior-rated products.
Shop Sealers, Primers & Undercoats at Paintworld
Set your next project up for success with the right Sealers Primers Undercoats. Explore the full range above, choose by surface and problem type, and move to topcoat with confidence.
