When plywood is cut, the newly exposed edge leaves the individual veneer layers more vulnerable to moisture. Sealing the edge can provide an additional layer of protection, particularly where plywood is being used in damp, humid or exposed environments.

In this guide, Plywood ETC explains how to seal plywood edges, what to use and when edge protection is worth considering.

Why Seal Plywood Edges?

Plywood is made from layers of wood veneer bonded together. The faces of the board provide a relatively continuous surface, but cutting the sheet exposes the individual layers along the edge.

If an exposed edge comes into contact with water or persistent moisture, it can absorb moisture more readily. Depending on the plywood type, grade and application, this can contribute to swelling, deterioration or delamination over time.

Sealing the edge does not change the underlying grade or specification of the plywood, but it can provide useful additional protection to an exposed cut edge.

How to Seal Plywood Edges

Sealing plywood edges is a straightforward job. Always follow the instructions for the particular edge-sealing product you are using.

What Can You Use to Seal Plywood Edges?

There are various products that can be used to treat plywood edges, depending on the application. Paints, varnishes and specialist wood treatments can all have a role to play.

For a dedicated panel edge treatment, Edge Sealer ESP Panels is specifically designed for sealing exposed edges of sheet materials.

Should You Seal Cut Plywood Edges?

If you have cut a sheet of plywood and the newly exposed edge could come into contact with moisture, sealing it is worth considering.

This can be particularly useful for plywood used in:

• Outdoor projects
• Construction and fabrication
• High-humidity environments
• Vehicle and workshop projects
• Furniture and storage projects
• Applications where exposed board edges need additional protection

Can You Seal Other Sheet Materials?

Edge sealing is not limited to plywood. Exposed edges of other sheet materials can also require additional protection depending on where and how the board is being used.

Plywood ETC stocks a wide range of OSB, MDF sheets and plywood for different applications.

Choose the Right Plywood

Edge sealing is only one part of protecting a plywood panel. The starting point should always be choosing a plywood product that is appropriate for the intended application and environment.

Plywood ETC stocks a wide range of plywood thicknesses and types, including 18mm plywood and specialist plywood products for different requirements.

If you're unsure which type of plywood you need, our plywood guide provides more information about the different types available.

How Do You Protect Plywood Edges After Cutting?

The simplest approach is to make sure the cut edge is clean and dry before applying a suitable edge-sealing product. Apply the sealer evenly and make sure there are no untreated sections, particularly around the ends and corners of the panel.

Taking a little extra time to protect exposed edges before installation can help reduce the risk of moisture reaching the vulnerable cut edge.