No. We do not recommend application in direct sunligt. If you apply wood protection in direct sunlight, you may see stripes, because the wood protection settles too fast, and there is not enough time for it to flow together. Note that this only applies to opaque and translucent wood protection and not for wood oils.
No (and yes). If you apply a regular water based wood protection, while it rains, this will ’rain off’, as the product is water soluble. Furthermore, the humidity becomes higher, and then the drying time is prolonged. The final result of the application may be a matted surface with spots and uneven texture. If you apply a solvent based product, when it rains, it will not ’rain off’, but you may see a matt and spotted surface as a result. New products are being developed, and in the Bondex range, there is a rain proof product available, which offers a ‘rain proof’ surface only 30 minutes after application.
In general, water based products are more sensitive than solvent based products, when there is a variation in the temperature. This is caused by the different drying processes. Water based products dry, because the water evaporates. If it is very hot, the product will dry too quickly and there will be visible brush marks on the surface. Solvent based products dry via a chemical process - the higher the temperature, the quicker the drying and vice versa. Normally we recommend a temperature between +10 - (+) 25°C during application and drying.
Yes. When the wood has been exposed to UV rays, for as little as 2 weeks, you should - in theory - sand before applying wood protection. The reason being that the binder in the wood (lignin), is degraded by UV-rays. You can typically see this when wood changes colour (greying/lighter colour).
It is extremely difficult to apply transparent wood protection with a spray, because the distance to the surface must be kept at a constant, or there will be a distinctive colour difference or overlapping of coats depending on product/drying. If spray application is carried out, the product must be diluted 20%. Normally you will need a finer
nozzle for solvent borne products than for water borne.
This depends on the product. Normally, solvent based products have a longer open-time, meaning that you can work with the product for a long time, before it starts to dry. On the other hand, water based products have a shorter open-time, so you cannot work with these products for very long, before they begin to dry. Also see under colours.
Yes. You can apply opaque wood protection with a roller. However, note that the roller will leave a roller structure on the surface - especially on planed wood and previously treated surfaces.
Normally, wide brushes are preferable on large surfaces, but round brushes are best suited, when you apply a solvent based product on e.g. windows.
The surface may crack, because the two coats act against each other during the drying period because of variations in the tension of the layers.