What Is the Best Way to Stain Wood?
The Wood Guide · Calculating with wood
TechniqueStaining wood
Stain accentuates the grain and changes the colour — but it does not protect against moisture and wear. If you know that, you avoid the two mistakes that ruin most staining jobs.
- Colours, does not keep out moisture
- Preparation decides everything
- Always a top coat over it
Staining in brief
Two misunderstandings cost most people their result, and both are easy to avoid.
Stain does not protect against moisture. It penetrates the wood and colours the fibre, but it does not lay a film over the surface. Without oil, lacquer or varnish on top, the wood stays just as vulnerable to moisture and wear as before — only in a different colour.
Stain magnifies every difference. Where the wood is more porous, it penetrates deeper and the colour turns darker. A trace of glue, a sanded patch or a soft earlywood zone therefore takes it up differently from the rest. That is exactly why poorly prepared wood turns blotchy.
Conifers have big differences between soft earlywood and hard latewood cells. Stain soaks deep into the soft part and barely into the hard part, which actually reverses the figure: the soft parts turn dark instead of light. A pre-stain primer or wood conditioner evens out that absorption.
- Oil-based
- deep-penetrating, durable — exterior wood
- Water-based
- quick-drying, low VOC — indoors and children's projects
- Gel stain
- stays put, penetrates less deeply — vertical surfaces
- Stain with a UV filter
- keeps its colour outdoors
- Always needed
- a top coat over it
- Decisive
- even preparation
To be fair: staining is hard to undo. Where paint can be sanded off, stain sits in the fibre — sometimes millimetres deep. Coming out too dark means, in practice: sanding deeper than you want, or living with it. So always test first on an offcut of the same wood.
Four types of stain
| Type | Characteristics | Recommended use |
|---|---|---|
| Oil-based | Deep-penetrating, durable, longer drying time | Exterior wood and heavily used objects |
| Water-based | Quick-drying, little odour, low VOC | Interior work and child-friendly projects |
| Gel stain | Thick, stays put, penetrates less deeply | Vertical surfaces and wood species that are hard to get even |
| With UV filter | Slows greying from sunlight | Cladding and garden furniture |
Stain colours the fibre; the pigment holds back some UV, but it does not protect against moisture or wear. Oil penetrates and protects from within, with the grain still tangible. Lacquer lays a closed film over the top and protects best, but if damaged it can only be repaired as a whole. In practice you combine stain with one of the other two.
In pictures · From bare wood to an even colour
Schematic drawing.
From bare wood to an even colour
- Sand evenlyWork through the grits in order — 120, 150, 180 — and don't skip any. Every skipped grit leaves scratches that the stain will only accentuate.
- Remove all dustVacuum, then wipe over with a slightly damp cloth. Dust in the pores gives grainy patches.
- Pre-treat soft woodWith pine, spruce and lime, apply a wood conditioner or pre-stain primer first, so absorption is even everywhere.
- Test on an offcutAlways, on the same wood and with the same preparation. The colour on the tin is an indication, not a promise.
- Stain along the grainWith a brush or cloth, apply generously, and after the stated penetration time wipe off the excess. Leaving it longer does not give a nicer result, just a stickier one.
- Let it dry completely, then finishOnly then apply oil, lacquer or varnish on top — otherwise the work is not protected.
An end-grain surface absorbs far more stain than a face side, and so turns almost black. Thin the stain there, or first brush the end grain lightly with a diluted coat before you do the rest.
Frequently asked questions about staining wood
Does stain protect the wood?
No. Stain colours the fibre but does not create a protective layer. It always needs a finish on top — oil, lacquer or varnish.
Why is my stain blotchy?
Because the wood absorbs the stain unevenly: through porous patches, glue residue or the difference between soft and hard growth rings. Even sanding and a pre-stain primer on soft wood solve that.
Can I remove stain again?
Barely. Stain sits in the fibre, sometimes millimetres deep. Sanding deeper is the only way back — so test on an offcut first.
Which stain for outdoors?
An oil-based stain with a UV filter. It penetrates deeply and slows greying. Finish it with an oil or lacquer suitable for outdoor use.
Staining in perspective
The result is decided before you open the tin — during sanding.
Have a question about your project? Just ask — we're happy to help.
Photo via Wikimedia Commons: Picea abies — Neitram, CC BY-SA 3.0
The Wood Guide
More in Care & finishing
- Impregnating wood
- Making wood water-resistant
- Applying a coat of varnish
- Working with a paint sprayer
- What are some creative ways to color wood with natural…
- Painting a wooden door
Other sections:Wood speciesUnderstanding woodChoosing & buyingBuild it yourselfTrees & forests