First, the use on the label
Makers formulate polyurethanes for particular uses and say so. Minwax's spar urethanes are made for exterior wood and wood exposed to sun or water, and Minwax says they are too flexible for floors; its Fast-Drying and Water-Based Oil-Modified polyurethanes are the ones it points to for interior floors. Start with the product made for where the piece will be. How polyurethane works, and how it differs from other films, is in the polyurethane guide; whether a film is the right family at all is in choosing a wood finish.
| Product | Base | Made for | Recoat | Use or cure | Cleanup |
|---|---|---|---|---|---|
| Minwax Fast-Drying Polyurethane | Oil | Interior wood, including floors | 4–6 h | Light use 24 h | Mineral spirits |
| Minwax Water-Based Oil-Modified Polyurethane | Water | Interior wood, including floors | 2 h | Light use 24 h | Warm water |
| Minwax Wipe-On Poly | Oil | Furniture and trim; floor touch-ups only | 2–3 h | Normal use 24 h | Mineral spirits |
| Minwax Helmsman Spar Urethane | Oil | Exterior, or interior exposed to sun or water; not floors | 4 h | Normal use 24 h | Mineral spirits |
| Minwax Water-Based Helmsman | Water | As above; non-ambering | 2 h | Normal use 24 h | Warm water |
| General Finishes Arm-R-Seal | Oil | Interior raw wood: cabinets, trim, doors, furniture | 24+ h | Cure 30 days | Mineral spirits |
| General Finishes High Performance | Water | Interior cabinets, trim, doors, furniture | 2 h | Cure 21 days | Soap and water |
From Minwax's product guide and General Finishes' data sheets (GF at 70°F and 50% humidity). Minwax states time to use and GF time to cure — different milestones, not to be compared as one number.
Choosing between them
- Outdoors: a product labelled for exterior use. Minwax says its spar urethane needs checking every year, and that no clear exterior finish permanently protects wood; decks and fences need other products.
- Floors: a product its maker labels for floors. Minwax says its spar urethanes are not suitable, and that Wipe-On Poly is for touch-ups only.
- Tabletops and furniture: any of the interior products. Minwax also lists bar tops and kitchen countertops among the uses for its spar urethanes.
- Over light woods and white paint: colour matters. General Finishes says Arm-R-Seal ambers over time and suggests a white poly over white surfaces; Minwax describes its water-based Helmsman as non-ambering.
- Over stain: check the stain maker's dry time first, and use one product per coat — Minwax says oil- and water-based polyurethanes must never be mixed, though either can go over the other once the first has fully cured.
- Over lacquer or wax: Minwax says polyurethane and lacquer are not compatible, and that wax must be removed before polyurethane goes on.
- Schedule and cleanup: the water-based products here recoat in about 2 hours and clean up with water; the oil-based ones take 4 to 24 hours and mineral spirits.
Butcher blocks and food surfaces
Only the maker's own claim counts. General Finishes describes its Wood Bowl Finish — an oil-based polyurethane — as 'food safe when cured', for bowls, utensils and decorative countertops, but says countertops used for chopping should get its mineral-oil Butcher Block Oil instead. No such claim appears for the other products in the table. See food-safe wood finishes.
Note— Specifications, not a test
These are the makers' published figures and uses, not BenchRoot measurements, and they do not say which film wears best. Use them to narrow the choice to products made for your use; then follow that product's schedule — see applying polyurethane. Oil-based products bring rag-fire risk; see finishing techniques.
Before buying a polyurethane
- Labelled for the use: interior, exterior or floor
- Oil- or water-based, for colour, schedule and cleanup
- Compatible with what it goes over, per its maker
- Recoat and use or cure times on its data sheet
- A food-contact claim from its maker, if the surface touches food
- How you will handle rags, for an oil-based product
Sources
Figures and uses are each maker's for its own product; Minwax publishes time to use and General Finishes time to cure, so the two are not directly comparable. Claims such as durability are the makers' and are not repeated as findings. No product was tested and none is ranked.
- 1.
Minwax Product Guide. Minwax.
Used for: Fast-Drying Polyurethane (oil-based, interior, including floors): recoat 4–6 h, light use 24 h; Water-Based Oil-Modified Polyurethane (interior, including floors): recoat 2 h, light use 24 h, warm-water cleanup; Wipe-On Poly: recoat 2–3 h, normal use 24 h, floors for touch-ups only; Helmsman Spar Urethane (oil) and Water-Based Helmsman for exterior wood or interior wood exposed to sun, water or temperature change, listing bar tops and kitchen countertops among uses, not for floors or decks, recoat 4 h and 2 h; no clear exterior finish permanently protects wood; water-based Helmsman non-ambering; oil and water products never mixed, but either over the other once fully cured; polyurethane and lacquer incompatible.
- 2.
Technical Data Sheet, Arm-R-Seal. General Finishes, 2020.
Used for: Arm-R-Seal as an interior oil-based polyurethane that ambers over time: 24+ h recoat, 30-day cure at 70°F and 50% humidity, mineral-spirits cleanup, rags in a fireproof container.
- 3.
Technical Data Sheet, High Performance Topcoat. General Finishes, 2019.
Used for: High Performance as an interior water-based acrylic/urethane blend: 2 h recoat, 21-day cure at 70°F and 50% humidity, soap-and-water cleanup; GF's white poly suggested over white surfaces.
- 4.
Wood Bowl Finish: Oil Based (product page). General Finishes.
Used for: Wood Bowl Finish, an oil-based polyurethane, described as food safe when cured for bowls, utensils and decorative countertops, and not for countertops used for cutting.
- 5.
Butcher Block Oil (product page). General Finishes.
Used for: Butcher Block Oil, a mineral oil, recommended by GF for cutting boards and butcher blocks.
About this buying 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.