Difference between stain and varnish: which offers the best protection?

When you want to protect and finish wood, you are often faced with a choice: stain or lacquer? Although stain and lacquer protect wood, they work in very different ways.

At Osmo, we believe in the benefits of stain and therefore do not offer lacquer. Lacquer lays a hard layer on the wood, whereas stain penetrates the wood and protects it from the inside out. This makes stain a moisture-regulating product and ensures that the wood grain remains visible, whereas lacquer often provides a glossy, dense finish.

Stain or lacquer? In this article, we discuss the differences between stain and lacquer.

Before choosing between stain and varnish, it is important to know what both products do and what effect they have on wood.

What is varnish and how does it work?

Varnish forms a hard protective layer on the wood, sealing the surface. This ensures a strong and waterproof finish, but can have disadvantages in the long run.

✔ Advantages of varnish:

• Provides an even finish and can give a beautiful shine.
• Varnish protects against dirt and moisture for some time because it forms a dense layer.
• Available in various variants such as transparent varnish, water-based varnish, and solvent-based varnish.

✖ Disadvantages of varnish:

• Varnish creates a hard layer, preventing the wood from breathing and causing it to crack or peel more quickly.
• Sanding and primer are required for maintenance, or resanding and varnishing.
• Less suitable for outdoor use; moisture can seep under the varnish layer, which can cause the wood to rot. Wood grain disappears under the lacquer layer, especially with opaque variants.
• Regular maintenance required. To keep the lacquer layer intact, you must reapply or touch it up over time, especially in areas with heavy wear.

What is stain and how does it work?

Stain penetrates the wood and protects it from the inside out, without forming a hard layer. As a result, the wood grain remains visible and the wood can breathe, minimizing the risk of cracking and peeling.

✔ Advantages of stain:

• Moisture-regulating, ensuring the wood remains well protected against weather influences.
• Wood continues to breathe, making it less prone to cracking or peeling.
• No primer needed; can be applied directly.
• Maintenance without sanding: a new layer can be applied over the old one.
• Available in transparent and opaque stains, allowing you to determine the coverage yourself.

✖ Disadvantages of stain:

Longer drying time; it usually has a longer drying time than, for example, lacquer or paint.

Less shine. Over time, it can discolor due to UV rays, especially with transparent variants. The wood may then turn gray. Fortunately, you can remove this with Osmo Power-Gel.

At Osmo, we believe in the natural protection of wood. That is why we work exclusively with stains and do not offer lacquer. Osmo stains protect wood for a long time and make maintenance easier than with lacquered surfaces.

Do you want a natural look where the wood grain remains clearly visible? Then choose Osmo stain:

• Osmo Natural Oil Stain: Provides color and protection without sealing the wood.
• Osmo UV Protection Oil: Perfect for vertical elements such as fences and window frames, prevents graying.
• Osmo Deck Oil: Specially developed for decking and patios, protects against moisture and dirt.

• Always apply stain in thin coats to achieve even coverage.
• Work in dry weather, at temperatures between 10°C and 25°C, for best drying.
• Test the color beforehand with a sample on a small piece of wood.

Apart from these products, you will also need sandpaper (grit 40/80/120).

• Clean dirt and stains with Osmo Deck Cleaner.
• Treat wooden decks twice a year to prevent slipperiness.
• Check annually whether a new coat of stain is needed.