It is always best to apply the sealant to the bare, unpainted wood. But in practice it is usually not possible, because most of the houses are already painted with something. Hence some advice and information to help you determine whether the surface is suitable or not.
- If the wood is treated against pests such devices (bochemit, lignofix, pine salt and the like), the surface remains adherent and can be sealed.
- Whether the filler coated with oil or natural. TLC staining, which is characterized by deep soak into the wood, we can generally say that these substance does not mind. If you are going to just paint, so it is better chink before painting.
If already painted, it is appropriate to wait at least several months after coating. This means they have time to soak into the wood. Rest is completed with the weather and partly the surface of wood becomes again abrasive (sun, rain).
- Inappropriate is to chink on a thick layer of wax , varnishes and similar materials which prevent contact with wood surface.
- If you are unsure, it is always a good idea to test on some joints, and after about 3 weeks to try to separate the material. This way you can see how well the surface of the wood is adhesive for sealant. Whether is easy to separate from the wood, the joints has to be cleaned up to the wood.
- Do not apply to other putty , which does not hold in the joints. It should be cleaned prior to cementation.