Most finishing schedules end with a clear coat, and most workshops default to whichever one they have always used. That is fine until a piece goes somewhere the coating was never designed for.
Nitrocellulose, or NC
NC is the workhorse of wood finishing and there are good reasons for that. It dries fast, so you wait less between coats and push more through the booth. It is clear and transparent, letting the natural beauty and grain of the wood show. It enhances colour and depth, making timber look richer. It can be sprayed, brushed or wiped, and it works on wood, MDF and veneer alike.
The quality that matters most in practice is repairability. If a defect appears mid-process, NC can be repaired and refinished easily. On a production line that is worth a great deal.
Gloss ladder: NC50 super high gloss, NC30 high gloss, NC20 satin, NC10 mat, plus NCHS for high solids where you want more build in fewer coats.
Where it is wrong: outdoors, and on metal.
Acrylic
Acrylic lacquers are true water white. They are clear and transparent, and they do not yellow, which is the single biggest reason to choose them over NC. On pale timbers and on the light palette that dominates export right now, yellowing is the difference between a sale and a rejection.
They are hard, weather resistant and lightfast. Touch dry in minutes so coats stack quickly. Good UV resistance, which helps the timber keep its tone. And low VOC compared with most solvent finishes, which matters for indoor air quality and for your operators.
Two variants worth knowing. The anti-graffiti grade resists tea, coffee, red wine, vinegar and mustard, which makes it the right answer for dining tables. And the acacia grade is formulated specifically to stop acacia turning red.
Polyurethane, or PU
Two-pack acrylic polyurethane produces the toughest, most durable finish available, indoors or out.
It provides a genuinely protective layer against scratches, stains, moisture and general wear, which makes it suitable for kitchen and bathroom applications where other systems struggle. Its UV resistance is excellent, which makes it the correct choice for outdoor furniture. It is compatible with hardwoods and softwoods, and it is available clear or as pigmented opaques in white, black, blue, green and red.
The trade-off is that PU is two-pack. Nothing in the range cures without its hardener, and mixing has to be right. It is less forgiving of a casual operator than NC.
Choosing in one line each
- NC — fast, forgiving, easy to repair. Indoor furniture, high volume.
- Acrylic — does not yellow, good UV. Pale timbers, natural looks, anything where colour fidelity matters.
- PU — toughest available. Outdoor, kitchens, bathrooms, anything that will be scrubbed.
And a fourth option
Water-based coatings are worth serious consideration: environment-friendly, odourless, non-yellowing and very low in VOCs, with fast drying that reduces wait time between coats. They keep the natural look of the timber with the grain showing through, and they sit happily over oil-based stains or under solvent topcoats. If your buyer is asking questions about VOCs, this is the conversation to have.