Can Microcement Be Applied Over Existing Worktops?

Often, yes — microcement can be applied over existing worktops, but the success of the finish depends on one thing: the substrate must be stable. If the base flexes, swells, or moves, the finish is far more likely to crack, debond, or telegraph imperfections.

Can microcement go over kitchen tiles?

Yes, microcement can be applied over tiles, but grout lines and movement need to be handled properly. Loose tiles must be re-bonded or removed, and grout lines often need levelling to reduce the risk of “telegraphing” through the finish.

• Fix any loose tiles first
• Clean and mechanically key the surface
• Use the correct primers and build-up
• Level grout lines where required

Can microcement go over laminate worktops?

Sometimes — but laminate is one of the riskier substrates. Laminate worktops can flex and the surface can be difficult to bond to without correct preparation. If the laminate or baseboard swells (for example from moisture), joints can open and movement can occur, which increases the risk of cracking or debonding.

If the existing worktop feels even slightly “springy”, or shows signs of water damage, rebuilding a rigid base is usually the safer long-term option.

Can microcement go over MDF or chipboard?

Possible, but caution is needed. MDF and chipboard are vulnerable to moisture and swelling. In a kitchen, even small amounts of water ingress can cause expansion at joints or edges. If that movement happens beneath a thin finish, it can lead to visible cracking or localised debonding.

If board-based substrates are used, they should be appropriately sealed, reinforced where required, and built to minimise movement.

Can microcement be applied over plywood or cement board?

Yes — a rigid board build-up is often one of the best foundations for a microcement worktop. The key is constructing a stable base with correct fixing, joint treatment, and reinforcement so the substrate behaves as one continuous surface.

Why substrate movement matters (and how it causes problems)

Microcement systems perform best when the substrate is stable. If joints open slightly over time — due to temperature changes, expansion, or moisture — water can potentially find its way behind the finish. Even if the microcement system is waterproof when applied correctly, moisture ingress behind the system can contribute to localised debonding.

When removal is the smarter move

• If the existing worktop flexes or feels unstable
• If there’s swelling, water damage, or delamination
• If tiles are loose or the base is crumbling
• If you want to reduce risk long-term (especially around sinks)

Applying microcement over existing worktops FAQs