Should You Seal Your Driveway After Cleaning? Acrylic vs Urethane Explained

Sealing is optional, but often worth it

After a professional clean, many driveways look dramatically better—but they can also be more exposed. On block paving in particular, cleaning can remove grime and algae, but it can also leave the surface more porous and the joints more vulnerable until re-sanded.

Sealing is popular because it helps you keep the “just cleaned” look for longer.

What sealing actually does

Phoenix Cleaning Sussex summarises the practical benefits of sealing in a way homeowners care about: it can reduce porosity, resist staining, and inhibit weeds, grass, algae and lichen, while making the area easier to maintain.

In plain terms, sealing helps by:

• Reducing how easily oil and dirt soak in

• Helping stabilise jointing sand (block paving)

• Improving colour and overall finish

• Making future cleaning faster and less aggressive

Acrylic sealants: the lower-cost option

Acrylic sealants are typically chosen when you want a cost-effective refresh.

Phoenix’s sealing page describes a basic matt acrylic finish and notes it’s commonly a two-coat process. It can stabilise jointing sand and inhibit weeds in joints. It also gives a “matt-look finish” and has a stated life expectancy of around 1 to 3 years, depending on conditions.

Best for:

• Block paving where you want a tidy, protected finish without premium pricing

• Driveways with lighter traffic

Urethane sealants: longer-lasting protection

Urethane sealants are positioned as the more durable option. Phoenix notes a pre-polymer urethane choice (matt or gloss) that typically lasts about twice as long between full treatments compared with acrylic and forms a strong bond while retaining normal flex in the pavement.

Best for:

• Higher-traffic driveways

• Homeowners who want a longer interval between treatments

• Anyone wanting a richer “enhanced” appearance (especially gloss options)

The critical prep step: re-sanding block paving

If you clean block paving, you often remove jointing sand. Before sealing, joints should be topped up with the correct sand and fully dry. This is one of the main differences between a professional finish and a DIY job that starts to look scruffy within months.

Timing matters

A common mistake is sealing too soon. Surfaces need to be:

• Properly cleaned

• Thoroughly rinsed

• Allowed to dry

• Correctly re-sanded (where relevant)

Rushing can trap moisture or reduce adhesion.

Don’t forget run-off and compliance

Sealing and cleaning both involve materials you don’t want entering surface water drains. Pollution-prevention guidance stresses controlling contaminated run-off and using the right drainage route/disposal method.

Is sealing right for you?

If your driveway:

• Gets slippery with algae

• Suffers repeated weed growth in joints

• Stains easily (oil, tyre marks)

• Needs to look sharp year-round

…then sealing after cleaning is often the upgrade that makes the clean “stick”.