Seal and protect Wooden surfaces with a Varnish finish
Wood varnishes provide a tough, durable top coat that seals and protects the wood surface from scuffs, stains, dirt and liquids. Available as water-based and solvent-based varnishes in a range of sheens, including ultra matt, matt, satin, gloss and super gloss, making them ideal for any wood care or restoration project.
Varnishes are tough, hard wearing and easily cleaned. Wood varnish is generally more durable than a wax or oil but is not as easy to maintain or repair if it becomes worn or damaged.
The retail market tends to search for Varnishes while the trade often refers to these products as Lacquers. Our lacquers section includes more solvent-based lacquers which tend to be used more by the trade. Varnishes are mostly water-based products which are recommended for use in the home. There isn't really a great deal of difference between them as a whole, its more familiar terminology
In a word, no. The trade tends to refer to them as "lacquers" and the public tend to refer to them as "varnishes", but they are ultimately the same thing.
In simple terms yes. Care must be taken however when applying the first coat of varnish over the stain. If using a brush or roller the first coat of varnish should be lightly applied and not overworked by repeated brushing or rolling. Excessive working of the varnish on top of the stain will re-hydrate the stain and may result in the dragging of the colour or the colour becoming intermixed with the clear varnish. A way to avoid this is to use solvent-based stains under water-based varnishes or water-based stains under solvent-based varnishes.
Most water-based lacquers or varnishes will last for at least a year if they are stored correctly and not allowed to freeze. Without knowing which specific lacquer you are referring to it's difficult to give a more specific answer.
The fact that it's 2-part or 2-pack doesn't really have any baring on the shelf life of the lacquer. The supplied catalyst only affects the product once mixed to provide a harder and usually quicker drying product.
Once the hardener or catalyst has been added to the lacquer it usually has a usable open time of around 4 hours. This can vary from one product to another so always check the manufacturers instructions and directions on the tin. It is recommended that only the amount required for each coat is mixed at any time to avoid product wastage. Any unused / unmixed product should last for 6 months to a year if stored correctly.
To get the best possible storage life out of the product, always follow the storage and usage instructions on the tin.
In the early days when water based varnishes were first introduced to the market they were a pale comparison to their solvent-based alternatives. Over the decades the formulations have been vastly improved and they are now as good if not better than many solvent based varnishes. For example, water-based varnishes tend to be clearer (not like the old toffee-apple varnishes of the 60's and 70's) are much less smelly to use in confined spaces, and are safer for both the user and the environment. Many of the toughest and most durable varnishes available today are water-based.
Preservers are always recommended before applying any exterior finish. Preservers help to prevent the wood from being affected by mould, algae and rot, giving the best possible protection. When applying a varnish or paint over the top it is important to ensure that any preserver used does not contain wax, as this will repel any water-based products that you try to apply over the top, causing adhesion issues.
Sticking with the same brand for compatibility is a better option. For example, Sadolin Yacht Varnish can be used over Sadolin Wood Preserver. If you find yourself using a different brands, we highly recommend that a test area is done to assess product suitability and compatibility. It's also worth keeping in mind that the top-coat manufacturer may not guarantee the performance of their topcoat if applied over a preservative from a different manufacturer.
