Description
UltraTile ProPrimer Advanced Polymer Primer is a versatile, ready-to-use bonding primer designed to enhance adhesion and reduce porosity ahead of tiling. Formulated for use on both porous and non-porous substrates, walls or floors, internally or externally, ProPrimer gives professional tilers a single, reliable primer for the vast majority of trade preparation work — including calcium sulphate screeds and underfloor heating systems.
Key Benefits
ProPrimer improves the bond between substrate and adhesive by sealing porous surfaces and laying down a consistent mechanical key on smooth or low-absorbency backgrounds. This reduces the risk of premature moisture loss from adhesives and levelling compounds, helping installations achieve their full designed strength. Its milky white, dries-clear formulation makes it easy to see coverage during application without leaving a visible residue once cured.
Applications
Suitable as a general-purpose priming solution before tiling, screeding or self-levelling on sand/cement screeds, concrete, calcium sulphate (anhydrite) screeds, plaster, plasterboard and other stable trade substrates. Widely used ahead of underfloor heating installations and on both walls and floors, internally and externally.
Performance & Features
- Advanced polymer formulation for exceptional bond strength
- Suitable for porous and non-porous substrates
- Milky white liquid, dries clear
- Use on walls or floors, internally or externally
- Compatible with calcium sulphate screeds and underfloor heating
- NBS Source registered for ease of specification
Compatibility
Pair with UltraTile ProFlex tile adhesives, ProAqua Shield tanking and UltraTile self-levelling compounds for a complete, specification-backed tiling build-up from subfloor to finished tile.
Millcot supplies genuine UltraTile trade products with full technical and safety datasheets, backed by knowledgeable trade support — helping you specify and install with confidence.
Key Features
- Enhances adhesion on porous and non-porous substrates
- Reduces substrate porosity ahead of tiling or screeding
- Ready to use — no complex mixing required
- Suitable for walls and floors, internal and external use
- Compatible with underfloor heating systems and calcium sulphate screeds
- Available in 1 litre and 5 litre bottles to suit any size of job
Applications
- Priming absorbent sand/cement screeds and concrete before tiling
- Sealing calcium sulphate (anhydrite) screeds prior to adhesive or SLC
- Priming plaster and plasterboard walls before tiling
- Improving key on smooth, non-porous or previously tiled surfaces
- Preparation ahead of underfloor heating floor build-ups
- General bathroom, kitchen and wetroom substrate preparation
Technical Specifications
- Unit sizes: 1 litre and 5 litre bottles
- Colour: Milky white liquid, dries clear
- Substrate types: Porous and non-porous
- Application temperature: 5°C to 25°C
- Application method: Brush, roller or spray, diluted according to substrate porosity per the technical datasheet
- Use with: UltraTile tile adhesives and self-levelling compounds
Always refer to the full UltraTile ProPrimer technical datasheet for exact dilution ratios, coverage rates and drying/overcoating times, as these vary with substrate porosity and site conditions.
What's Included
One ready-to-use bottle of ProPrimer Advanced Polymer Primer, supplied in either a 1 litre or 5 litre bottle. Select the size that suits your job from the dropdown above.
FAQs
Can ProPrimer be used on both walls and floors?
Yes, ProPrimer is suitable for wall and floor applications, both internally and externally.
Is ProPrimer suitable for calcium sulphate (anhydrite) screeds?
Yes, it is specifically designed to prepare calcium sulphate screeds ahead of tiling or self-levelling.
Does ProPrimer need diluting?
Dilution depends on substrate porosity — refer to the technical datasheet for the correct ratio for your substrate.
Is ProPrimer suitable for use with underfloor heating?
Yes, it is compatible with underfloor heating systems as part of a correctly prepared floor build-up.
What size should I order?
The 1 litre bottle suits small domestic jobs, while the 5 litre bottle is more economical for larger commercial areas — check the datasheet coverage rate to calculate quantity needed.
Does ProPrimer leave a visible residue once dry?
No, ProPrimer is milky white when applied but dries clear.