The surface itself has no structural value — it relies entirely on the base beneath it and on disciplined mixing, weather awareness and accurate depth. Get those right and you have a seamless, permeable drive for 15–25 years; get them wrong and the only cure is often a full strip-out and re-lay.
The step-by-step professional process
- Survey. A competent installer visits before quoting — checking ground conditions, the existing surface, drainage, levels, edges and access. Quoting without a site visit is a red flag.
- Excavation and sub-base. Dig out, remove organic matter, then build and compact the permeable sub-base.
- Edge restraints. Aluminium channel or kerbs are set in concrete with the top face exactly at finished surface height.
- Clean and prime. The base is washed, dried fully, and primed where required.
- Forced-action mixing. Aggregate and two-part resin are mixed until every stone is coated.
- Laying and trowelling. A small team works in rhythm, trowelling to a consistent depth and working back toward the exit.
- Curing. The area is cordoned off and protected from rain.
Base and groundwork
The sub-base is the most critical layer — most failures start here. A SUDS-compliant build uses a minimum of 150 mm of MOT Type 3 (open-graded and permeable, unlike tightly-packed Type 1), topped with 50–70 mm of open-graded asphalt, then the resin bound wearing course at around 18 mm for a drive. Each layer is machine-compacted in lifts; hand compaction is not enough. Any new tarmac or concrete base must cure for at least two weeks first.
Why forced-action mixing is mandatory
A forced-action (pan) mixer uses rigid paddles to grip and coat every stone evenly. A cement (drum) mixer just tumbles the material, leaving stones part-coated — the classic cause of early loose-stone failure. Hand-mixing has the same problem and cannot keep pace. This is non-negotiable for anything bigger than a trial patch.
Weather, temperature and the best season
Resin is moisture- and temperature-sensitive. Below 5°C do not install; 5–10°C needs a catalyst; 10–25°C is the optimal window; above 25–30°C pot life shortens sharply. The surface must sit at least 3°C above the dew point, and humidity should be below about 80–85%, with no rain forecast for several hours either side. The best UK season is late April to August; November–January is high-risk and most quality installers decline it.
Cure times and job duration
Expect touch-dry in 2–4 hours, foot traffic in roughly 6–12 hours, and vehicles after 24–48 hours (always the full 48 in cool or humid weather), with full chemical cure at about 7 days. A small overlay can be a single day; a medium drive 2–4 days depending on excavation; larger jobs 3–5+ days. A large drive “finished in a few hours” is almost certainly cutting corners.
DIY resin driveway kits
Kits include pre-weighed aggregate and two-part resin — but not a forced-action mixer, a team or weather instruments. A careful DIYer can manage a small path or step surround (under about 15 m²) with a hired mixer and a second pair of hands. For a full driveway, manufacturers themselves advise against DIY. It typically fails on using a cement mixer, damp aggregate, working alone, poor base prep, the wrong weather, or spreading too thin.
Signs of a good vs bad install
Good: a physical survey; named UV-stable resin; a forced-action mixer on site; a proper team; full-depth excavation where needed; mechanical compaction; temperature, humidity and dew-point checks; consistent depth; edges trowelled flush; the area cordoned during cure. Bad: no site visit; a suspiciously low price; a cement mixer; one person working alone; laying on a damp or frosty day; resin straight over block paving; no edge restraints; a whole drive done in a few hours; “drive on it tomorrow”; or white blooming within hours.
This is why the installer matters most — see how to choose a resin driveway installer. For the finished surface and its upkeep, see maintenance, and to price a job use the cost calculator.