Question 1

Is Bostik Cementone Flexacryl the same as Bostik Flexacryl?

Accepted Answer

Yes. Cementone Flexacryl is simply a branded version of Bostik Flexacryl under the Cementone trade name. The product formula, performance, and instructions are identical. You may see different names listed at different merchants, but they refer to the same roof repair compound.

Question 2

How long does Flexacryl take to dry?

Accepted Answer

As a quick‑drying roof repair compound, Flexacryl can be touch-dry in 30–60 minutes depending on temperature/humidity. It’s designed to cure fully in 12–24 hours.

Question 3

Can you paint over Flexacryl?

Accepted Answer

Yes, once fully cured it can be overpainted with standard roof coatings to match your existing roof colour or left grey.

Question 4

Can I use Flexacryl in winter?

Accepted Answer

Yes. Flexacryl can be applied in winter conditions down to around -10 °C. However, colder temperatures will slow the drying and curing process. Always remove frost, ice, or standing water before applying. It’s best to work on a dry day with no rain forecast. Allow extra time for the compound to set fully in low temperatures.

Question 5

How much roof will a 5 kg tub of Flexacryl cover?

Accepted Answer

A 5 kg tub will cover about 1.5 m² when applied at a standard 2 mm thickness. Coverage can vary depending on how rough or porous the surface is. Heavily weathered roofs may need more product for an even coat.

Question 6

Do I need a primer before applying Flexacryl?

Accepted Answer

In most cases, a primer is not needed, as Flexacryl adheres well to clean and dry surfaces. However, very porous, chalky, or dusty substrates may reduce adhesion. For these, a suitable priming coat can help create a stable base. Always remove loose material and debris before application.

Bostik Flexacryl

Cementone Flexacryl Instant Repair For Roofs Waterproofing Grey 5kg

Bostik Flexacryl Instant Repair Waterproof Roof Coating, Black, 5 KG