31°C, New York
Notification products, updates
Between November drizzle and July heatwaves, a British driveway takes a beating. Water soaks into block paving joints, frost lifts edges, and the occasional oil drip from a leaking sump leaves a stain that never quite fades. A decent sealer forms a protective film across the surface that sheds water, binds jointing sand in place and makes cleaning far easier.
Two families of product dominate the market: acrylic and polyurethane. Both work, but they behave very differently once they are out of the tin. Choosing well comes down to the surface you have, the traffic it gets and how much time you can give the job.
Most acrylic driveway sealers sold in the UK are water-based. That means low odour, brushes and rollers that clean up in soapy water, and a forgiving application that suits a confident DIYer. They are typically touch-dry in one to two hours on a warm day, ready for a second coat after four to six hours, and fully cured within 24 to 48 hours. You can usually walk on the surface the same evening.
Acrylics are breathable, which matters on block paving and older concrete. Moisture vapour can escape rather than being trapped beneath a plastic-like skin, reducing the risk of blistering and efflorescence. They also hold their colour well, because the resin resists UV degradation and will not yellow noticeably.
The trade-off is wear. Expect to reapply every one to three years on a busy driveway, and sooner on a north-facing or heavily trafficked area. Acrylics offer limited resistance to petrol, oil and de-icing salt, and they tend to dry to a satin or low-sheen finish rather than a deep gloss.
Polyurethane is the harder-wearing choice. It cures into a tougher, more flexible film that copes better with thermal movement, standing water and freeze-thaw cycles. On a well-prepared surface, a good polyurethane sealer can last three to seven years, and it shrugs off oil, petrol and hydraulic fluid spills that would stain an acrylic finish.
The catch is timing. Recoat windows are typically 12 to 24 hours, full cure takes three to seven days, and you should keep vehicles off for at least 48 to 72 hours. Solvent-based versions smell strongly and need proper ventilation. Some formulations also darken or slightly amber over time under strong sun, though modern aliphatic versions have largely solved this.
Cost per tin is higher, and the finish can be more slippery when wet, especially at a high gloss. If your driveway slopes towards the road or a garage, consider a matte or satin polyurethane with an anti-slip additive.
Block paving and clay pavers sit well with acrylic. The joints stay flexible, sand stays put, and the breathable film lets the sub-base dry out naturally. If your block drive is over ten years old and gets heavy use, a polyurethane can be worth the extra outlay.
Concrete and pattern-imprinted concrete suit either, though polyurethane's hardness resists tyre scuffing and de-icing salt better on a drive that sees two or more cars daily. Tarmac is the awkward one: acrylic is generally the safer bet because it will not soften or react with the bitumen binder. Resin-bound and resin-bound gravel surfaces should only be treated with products specifically formulated for them, and often need no sealer at all.
The best sealer in the world fails on a poorly prepared drive. Sweep thoroughly, treat moss and algae, and let the surface dry for at least 24 to 48 hours after rain. Check the jointing sand and top it up before sealing, not after.
Work in dry conditions with temperatures above 10°C, ideally between 15°C and 25°C, and check that no rain is forecast for 24 hours after an acrylic coat or 48 hours after polyurethane. Apply thin coats rather than one heavy flood, using a roller for large areas and a brush for edges and around drainage channels. Two coats are standard; three are not unusual on porous block paving.
As a rough guide, expect coverage of 4 to 6 square metres per litre for acrylic and 3 to 5 for polyurethane, though always follow the tin. Buy slightly more than you calculate, keep the remainder sealed, and store it away from frost so you can touch up worn patches next spring.
Choose acrylic if you want a quick, breathable, budget-friendly job you can repeat easily. Choose polyurethane if you want maximum protection and do not mind waiting a few days for the drive back. Either way, preparation and dry weather will matter more than the label on the tin.
SiteSeal shares practical, down-to-earth guidance on uk property damp-proofing, waterproofing and sealant advice for readers across the UK.
Stay Tuned With Updates
Leave A Comment