Before the stain
- Sand to the stain maker's grit, no further. Minwax asks for #220 before its Wood Finish; General Finishes says no finer than 150 on hardwoods and 180 on softwoods before its Gel Stain. The reasons and the full comparison are in how to sand wood.
- Remove the dust completely; it mixes with the stain and leaves specks.
- Test on an offcut of the same board, through to the topcoat. Colour on the can and colour on your wood differ, and the topcoat changes it again.
- Water-based stains raise the grain. General Finishes says to wet the wood, let it dry and sand smooth before its Dye Stain.
Conditioning woods that blotch
A conditioner or washcoat partly fills the most absorbent areas so they take stain more like the rest. Minwax names pine and spruce, and alder, aspen and maple, as woods to condition. The conditioner must match the stain's base, and its timing matters:
| Product | Use with | Stain within | Note |
|---|---|---|---|
| Minwax Pre-Stain Wood Conditioner | Oil-based stains only | 2 hours | Wipe excess after 5–15 min; after 2 h, re-sand lightly with #120–180 |
| Minwax Water-Based Pre-Stain Conditioner | Water-based stains, all woods | After 15–30 min | Sand lightly once dry, as Minwax directs |
| Zinsser SealCoat, thinned | Under stain on softwoods | When dry | Dewaxed shellac; thinned as Zinsser directs |
| General Finishes Pre-Stain Natural | GF Dye Stain on blotchy woods | Per its label | Named in GF's Dye Stain data sheet |
From Minwax's product guide and Zinsser's and General Finishes' data sheets. Not every blotch can be fixed: the Forest Products Laboratory notes that wood infected by fungi or bacteria before drying absorbs unevenly in ways no conditioner corrects.
Applying the stain
Staining, on the makers' instructions
Stir, don't shake
Minwax says to stir its stain well before and during use, and not to shake or thin it, so the colour stays evenly mixed.
Apply with the right tool
A brush or cloth for most oil stains. General Finishes says to apply its Dye Stain with a brush, pad or sprayer — not a rag — and its Gel Stain with a rag, brush or pad.
Let it penetrate, then wipe
Minwax leaves its Wood Finish 5–15 minutes — longer for a deeper colour — then wipes the excess off with the grain, blending lighter and darker areas. Pigment left on the surface can stop the topcoat sticking, Minwax warns.
Work in sections
Keep a wet edge so laps do not show, and wipe each section in the same way and for the same time.
A second coat only to darken
Minwax's data sheet allows a second coat of Wood Finish after 2 hours; its product guide gives 2–4 hours by colour. General Finishes waits until its gel stain is completely dry, 24 hours or more. Minwax says not to sand between coats of stain.
Drying and topcoating
A stain is not a finish; the makers all call for a clear coat over it. When it can go on depends on both products. Minwax gives 4–6 hours before a topcoat over Wood Finish in its product guide, but says its water-based Polycrylic should wait until the stain has dried completely, generally about 24 hours. General Finishes specifies three coats of topcoat over both its dye and gel stains, and warns against sanding through the first coat and into the colour. Choosing the topcoat is in polyurethane and wood finish types; applying it, in applying polyurethane.
Safety— Rags from oil-based stain
Minwax warns that rags, steel wool and sanding residue soaked with its oil-based stain may catch fire on their own if improperly discarded, and says to put them at once into a sealed, water-filled metal container and dispose of them under local fire regulations. NFPA explains why: the oils release heat as they dry, and a pile traps it. Follow the label of the stain you use.
Staining
- Sanded to the stain maker's grit, dust removed
- Colour tested on an offcut, through the topcoat
- Conditioner matched to the stain base, and its time window kept
- Excess wiped off evenly, with the grain
- Dry for the maker's time before a second coat or topcoat
- Rags dealt with before you leave the room
Sources
Times are each maker's for its own product; where a maker's data sheet and product guide differ, both are shown. Use the instructions for the stain and conditioner you actually have.
- 1.
Product Data Sheet, Minwax Wood Finish (MWX132). Minwax, 2026.
Used for: Bare, clean wood sanded with #220; Pre-Stain Wood Conditioner on softwoods; a test on a hidden spot; stir, do not shake or thin; wipe excess with the grain, longer for darker; recoat after 2 hours to darken; no sanding between coats; dry completely before topcoat; rags and sanding residue into a sealed, water-filled metal container.
- 2.
Minwax Product Guide. Minwax.
Used for: Pre-Stain Wood Conditioner: oil-based, for oil-based stains only, excess wiped after 5–15 minutes, stain applied within 2 hours or the wood lightly re-sanded (#120–180); Water-Based Pre-Stain Conditioner: for water-based stains on all woods, stain after 15–30 minutes and a light sanding; woods that blotch; Wood Finish left 5–15 minutes, recoat 2–4 h and topcoat after 4–6 h by colour, Polycrylic only once fully dry (about 24 h); Gel Stain recoat 8–10 h.
- 3.
Technical Data Sheet, Gel Stain. General Finishes, 2020.
Used for: Gel Stain applied with a rag, brush or pad, excess removed, a second coat once the first is completely dry (24+ h), sanded no finer than 150/180, finished with three coats of topcoat.
- 4.
Technical Data Sheet, Dye Stain. General Finishes, 2020.
Used for: Dye Stain not applied with a rag, the wood wetted and sanded first to reduce grain raising, GF's Pre-Stain Natural on blotchy woods, a second coat after the first is completely dry, care not to sand through the first topcoat.
- 5.
Technical Data BEY-07, Bulls-Eye SealCoat Universal Sanding Sealer. Rust-Oleum (Zinsser).
Used for: SealCoat, thinned as Zinsser directs, as a pre-stain conditioner against uneven stain penetration on softwoods such as pine.
- 6.
Christopher G. Hunt. Wood Handbook: Wood as an Engineering Material (FPL-GTR-282), Chapter 16: Finishing Wood. USDA Forest Service, Forest Products Laboratory, 2021.
Used for: A washcoat before stain to even the colour; blotching from fungal or bacterial infection that cannot be corrected once stained.
- 7.
Safety with Oily Rags (safety tip sheet). National Fire Protection Association, 2019.
Used for: Rags wet with oil-based stain heating as they dry; NFPA's procedure for them.
About this guide
Written by BenchRoot Editorial. How BenchRoot sources, checks and corrects its pages is set out in the Editorial Policy. If something here is wrong or unclear, the contact page explains how to tell us.