Stopgap P121 Primer - 5L
Stopgap P121 Primer - 5L
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Stopgap P121 Primer - 5L
F. Ball Stopgap P121 is a high-performance acrylic primer developed to prepare calcium sulphate (anhydrite) screeds before the application of Stopgap smoothing compounds and compatible flooring adhesives. It improves adhesion, controls substrate absorbency and helps prevent unacceptably rapid drying of smoothing compounds and adhesives.
Its distinctive blue colour provides excellent visual coverage during application, helping to ensure the entire floor has been primed evenly. Stopgap P121 is non-flammable, easy to apply and suitable for use over normal underfloor heating systems.
Why Choose F. Ball Stopgap P121?
- Specifically developed for calcium sulphate and anhydrite screeds.
- Promotes excellent adhesion of smoothing compounds and adhesives.
- Controls substrate absorbency.
- Helps prevent rapid drying of adhesives and smoothing compounds.
- Blue colour provides visual control during application.
- Easy to apply by roller or brush.
- Non-flammable formulation.
- Suitable over normal underfloor heating installations.
Ideal For
- Calcium sulphate screeds.
- Anhydrite screeds.
- Preparing subfloors before Stopgap smoothing compounds.
- Reducing substrate absorbency.
- Domestic flooring projects.
- Commercial flooring installations.
- Underfloor heating systems.
Professional Advice
Calcium sulphate screeds require the correct preparation before levelling compounds or adhesives are applied. Stopgap P121 is specifically formulated for these substrates and helps provide a consistent, well-bonded surface for the next stage of your flooring installation.
Once primed, choose the appropriate Stopgap levelling compound depending on your project requirements, substrate type and installation times.
Technical Specifications
| Product Type | Acrylic Primer |
|---|---|
| Pack Size | 5 Litres |
| Colour | Blue |
| Application Method | Brush or roller |
| Coverage | Approximately 40m²–60m² per 5L depending on substrate porosity* |
| Drying Time | Approximately 1 hour under normal conditions* |
| Suitable Subfloors | Calcium sulphate (anhydrite) screeds. |
| Underfloor Heating | Suitable for normal underfloor heating installations. |
| Flammability | Non-flammable. |
Prepare Your Subfloor Like a Professional
Correct preparation is essential for a smooth, durable and long-lasting flooring installation.
1. Check for Moisture
Ensure the screed has reached the manufacturer's recommended moisture content before priming or installing floor coverings.
2. Prime the Surface
Apply Stopgap P121 evenly across the prepared calcium sulphate screed. The blue colour helps ensure complete and consistent coverage.
3. Repair Any Imperfections
Use Stopgap Micro Rapid for minor repairs and feather edging, or Stopgap 400 Repair for larger repairs before levelling.
4. Choose the Right Levelling Compound
Stopgap Fast-Track 30 – Ideal when speed is the priority.
Stopgap 700 Superflex – Flexible formulation for timber and plywood.
Stopgap 1200 Pro – Excellent for refurbishment projects over suitable adhesive residues.
Stopgap 300 HD – Heavy-duty smoothing compound for demanding environments.
Need Help Choosing?
Not sure which primer your subfloor requires? Contact our flooring specialists with details of your substrate and we'll help you choose the correct preparation system.
Important Information
- For internal use only.
- Apply only to clean, sound and correctly prepared subfloors.
- Allow the primer to dry before applying smoothing compounds or adhesives.
- Always follow the latest F. Ball Technical Data Sheet.
- Coverage varies depending on substrate porosity.
*Coverage and drying times are based on normal site conditions. Highly porous substrates, lower temperatures or increased humidity may affect performance.
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