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Wood Treatments: Varnishes, Wood Stains, and Oils

Wood needs protection from three enemies: water, ultraviolet radiation, and living organisms (fungi and wood-boring insects). Here you'll find varnishes, wood stains, oils, enamels, and protectors for interior and exterior carpentry, furniture, and structures.

Varnish, Wood Stain, or Oil: The Real Difference
Closed Pore vs. Open Pore. Varnish forms a continuous film on wood: it protects a lot, but when it fails, it needs thorough sanding. Wood stain penetrates and allows the pore to breathe: it protects a bit less, but it's maintained with a simple touch-up without stripping. Outdoors, this difference determines how much work it will give you in five years.
Product Finish Maintenance Suitable for
Varnish Glossy or satin film Sand and re-varnish when it peels Interiors, furniture, floors, doors
Wood Stain Open pore, visible grain Clean and apply another coat Exteriors, windows, porches, fences
Oil Natural, matte, wood feel Re-oil periodically Countertops, teak, garden furniture
Enamel Opaque, covers the grain Sand and repaint When color matters more than wood
Usage Classes: How Much Protection Do You Need?

The European standard classifies wood exposure. Knowing which class your piece falls into prevents undershooting (and having to redo the work) or overusing product.

  • Class 1: dry interior. Furniture, paneling. Decorative finish is sufficient.
  • Class 2: interior with occasional humidity. Bathrooms, covered roofs.
  • Class 3: exterior without ground contact. Windows, porches, fences.
  • Class 4: direct contact with ground or water. Requires autoclave-treated wood, not just finish.
Correct Application Order
  • 1 → Make sure the wood is dry. Above 18% moisture, almost no finish adheres well.
  • 2 → If there's insect or fungal attack, treat with a protector first. The finish doesn't cure anything.
  • 3 → Sand along the grain and remove all dust.
  • 4 → Apply primer or sealer if the system requires it.
  • 5 → Two or three coats of finish, sanding lightly between coats. Outdoors, focus on end grain and edges: that's where water enters.
Explore by type: varnishes and lacquers, wood stains, oils, woodworm treatments, wood fillers and chalk paint. Questions? WhatsApp +34 621 20 71 54.

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