HYDRONYLON HMS(P)
Primer and base layer of the system on metal substrates, applied before the HYDRONYLON HN top coat.
Prices
| Pack | Retail price |
|---|---|
| 5 kg | £91.00 |
| 25 kg | £454.00 |
HYDRONYLON Approved Contractors buy at preferential trade rates.
HYDRONYLON LTD is not currently registered for VAT, so no VAT is charged - the prices shown are the final prices payable.
Where it fits in the system
On metal roofs, HYDRONYLON HMS(P) prepares the substrate and forms the base of the system. It is applied at 0.25 kg/m² and the build-up is completed with the HYDRONYLON HN top coat.
How the system worksTechnical parameters
| Role in the system | Primer and base layer on metal substrates |
|---|---|
| Colour | Grey |
| Pack sizes | 5 kg, 25 kg |
| Consumption | 0.25 kg/m² |
| Interval before top coat | Min. 24 h |
| Application conditions | +10°C to +35°C around the clock, relative humidity up to 85% |
| Storage | +5°C to +30°C; use within 30 days of opening |
System performance (ETA-23/0735)
| External fire performance | B(roof)(t1) |
|---|---|
| Reaction to fire | Class E |
| Watertightness | Watertight |
| Wind load resistance | Pass (> 50 kPa) |
| Working life category | W2 (10 years) |
| User load category | P3 (Normal) |
| Roof slopes | S1 to S4 |
| Surface temperature range | -20°C (TL3) to +80°C (TH3) |
| Minimum dry film thickness | Felt 1.8 mm, metal 0.7 mm, mineral 0.75 mm, PVC 1.2 mm |
| Notified Body | No. 1454 (Łukasiewicz - Warsaw Institute of Technology) |
Coverage
- Allow 0.25 kg/m² on metal substrates.
- Example: a 50 m² metal roof needs 12.5 kg, which is covered by three 5 kg buckets or a single 25 kg bucket.
- Complete metal build-up materials cost: £16.39/m² (materials only; HYDRONYLON HMS(P) 0.25 kg and HYDRONYLON HN 1 kg per m²).
Application notes
- Apply at +10°C to +35°C around the clock, at relative humidity up to 85%; never on wet or frozen substrates or during rainfall.
- Apply at 0.25 kg/m² on metal substrates.
- Allow a minimum of 24 h before applying the HYDRONYLON HN top coat.
- Mix before use and do not dilute. Clean tools with warm water and detergent.
Downloads
- Retail price list 2026 (PDF)
- European Technical Assessment ETA-23/0735 (PDF)
- UK Declaration of Performance 2026 (PDF)
- HYDRONYLON HMS(P) technical data sheet (PDF): available soon.
Frequently asked questions
What is HYDRONYLON HMS(P) used for?
HYDRONYLON HMS(P) is the primer and base layer of the system on metal substrates. It is applied at 0.25 kg/m² and the build-up is completed with the HYDRONYLON HN top coat.
Which pack sizes are available?
HYDRONYLON HMS(P) is supplied in 5 kg buckets at £91.00 and 25 kg buckets at £454.00. HYDRONYLON Approved Contractors buy at preferential trade rates.
How much do I need for my roof?
Allow 0.25 kg/m² on metal. A 50 m² metal roof needs 12.5 kg, which is covered by three 5 kg buckets or a single 25 kg bucket.