Choosing a Finish for Hardwood Furniture: Oil, Hardwax or Epoxy

The finish decides how your piece looks, how well it stands up to spills and heat, and how easy it is to fix. For hardwood furniture and live edge tables, most people choose between three families: penetrating oil, hardwax oil and epoxy. Here is how they compare and where each one fits.

The short version

• Penetrating oil: the most natural look and the easiest to apply, but the least protection. Best for decorative pieces and cutting boards.
• Hardwax oil: a natural look with real protection against water and wear, and easy spot repair. Our usual pick for dining tables, desks and coffee tables.
• Epoxy: fills voids and can build a thick, glass-like coat. Best for fills, river tables and bar tops, usually under or alongside another finish.

Penetrating oil

Penetrating oils soak into the wood and harden inside the fibres instead of forming a film on top. The grain looks rich and the surface feels like wood. The trade-off is protection: water rings and stains reach the wood more easily, and you will re-oil more often. For cutting boards and butcher block, use a food-safe oil and re-apply whenever the board looks dry. Never use a film finish on a cutting board.

Hardwax oil

A hardwax oil combines natural oils and waxes. The oil penetrates the wood and the wax leaves a thin, tough surface that resists water and wear, without the plastic look of a thick film. Its biggest advantage is repair: a scratched or worn area can be lightly sanded and re-coated, and the new finish blends in with no lap marks or peeling.

We stock OSMO Polyx-Oil in several sheens:

• Clear Matte 3031 and Clear Satin 3043 for a natural, low-sheen table top.
• Clear Gloss 3011 when you want more shine.
• Raw 3051 for light woods such as maple and white oak, when you want them to look closer to unfinished wood.

If you want colour, OSMO Wood Wax Finish comes in tones such as Walnut 3166, Cognac 3143, Light Oak 3103, White 3111 and Granite Grey 3118, plus Clear Extra Thin 1101. On a surface that gets daily use, plan a clear Polyx-Oil coat over the colour; ask at the counter which combination suits your wood.

Applying it: sand evenly to the grit the can recommends, remove all dust, and apply very thin coats with an OSMO roller or Superpad, working the finish into the wood. Thin coats matter more than anything else; a heavy coat stays soft and tacky. Most tables get two coats. Follow the drying times on the can. For cleaning afterwards, OSMO Wash and Care 8016 is made for oiled and waxed surfaces.

Epoxy

Epoxy is a two-part resin that cures hard and waterproof. On furniture it does two different jobs:

• Filling. Deep-pour epoxy fills knots, cracks, bark inclusions and the river in a river table. Pigments let you colour the fill.
• Coating. Coating epoxy builds a thick, glossy layer over the whole surface, common on bar tops.

An epoxy coat is very water resistant, but it has downsides. Scratches show on the high gloss, damage is hard to repair invisibly, and epoxy can yellow over time in strong sunlight. Many slab tables use epoxy only for fills, sanded flush, with a hardwax oil over the whole top. Pour epoxy on bare wood. Oil first and the epoxy will not bond. Browse epoxy and pigments and follow the maximum pour depth on the product.

Which finish for which piece

• Dining table or desk: hardwax oil in matte or satin. Easy to live with and easy to repair.
• Coffee table or side table: hardwax oil, or a coloured Wood Wax Finish under a clear coat.
• Live edge slab with voids: epoxy fills, then hardwax oil over the whole top.
• Bar top or high-spill counter: a coating epoxy, accepting that repairs are harder.
• Cutting board or butcher block: a food-safe penetrating oil.
• Outdoor cedar: none of the interior finishes above. Use a decking oil made for exterior wood.

Test before you commit

Every species takes finish differently. Walnut deepens, cherry darkens with light over time, and maple can look yellow under some oils. Always test on an offcut of the same board, sanded the same way, before you finish the real piece.

Or let us finish it

If you would rather not finish it yourself, our finishing service sands the piece, fills small voids with epoxy and applies a spray polyurethane top coat. We also offer sanding at $28 per square foot ($200 minimum) and slab flattening. Read How to Flatten a Live Edge Slab if you are preparing a slab yourself.

Come and see the OSMO range and finish samples at Kingma Lumber, 4607 91 Ave NW, Edmonton, or call (780) 229-7681.