How much primer should I apply per square metre?

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Achieving the right application thickness is essential for the best performance when using Caldart epoxy primer. Understanding coverage rates helps ensure your substrate is well-prepared for long-lasting results.

Typical Coverage Rates Explained

The amount of primer you’ll need depends largely on how porous your substrate is. For most applications, expect to use between 100 and 300 grams of primer per square metre. Less porous surfaces like sealed concrete or ceramic tiles usually require coverage at the lower end of this range, while rougher, highly absorbent substrates such as screed or timber will need more product to achieve a consistent layer.

Tips for Accurate Application

To get the most even coverage, start by determining the porosity of your surface. Apply the primer with a suitable tool, such as a short-pile or large roller. For detailed or edge work, short-pile rollers provide control, while large rollers are ideal for large areas. Spread the primer in a thin, uniform coat and avoid over-application, which can lead to excessive build-up or slower curing.

For ease of use and professional results, consider using resin application rollers designed specifically for epoxy work.

When Application Rate Really Matters

Getting the coverage right is crucial when priming very porous surfaces or preparing a base for decorative or high-traffic epoxy flooring. Insufficient primer may lead to weak adhesion or uneven finishes, so take extra care in measuring out your application rate for these projects.

Related products

• "Epoxyprimer" – Universal Water-Based Two-Component Epoxy Floor Primer
• Resin & Paint Application Rollers – Short-Pile, Large, and Sponge Types

Related guides

• How To Apply Caldart Epoxy Primer

Setting an appropriate primer thickness is a key part of successful Caldart epoxy primer application. For a complete guide to the application process, see our main primer application FAQ.