Similarly to human skin, a good coating system for the substrate of wood requires individual layers that are perfectly linked to one another. The application of these layers requires adherence to specific instructions in order to ensure the best possible results and durability of the substrate. Coating systems require more than one layer to provide protection and an appealing surface.
The first layer, the primer, is important for the adhesion of the following layers. If this very thin layer is destroyed, the outdoor durability of the coating system will suffer. The second layer, the midcoat, is thicker than the primer. It provides a great deal of benefits for the last layer.
The importance of a midcoat
First of all, the midcoat gives you a good body for sanding. The primer is often sanded to cut the first rising fibres. As the primer is very thin, it can actually be sanded away rather quickly. However, this will not happen so fast when it comes to the sanding of the midcoat. Furthermore, this also excludes the risk of fibres rising again in the last layer.
The second reason for using a midcoat is the improved pore filling. A thinner layer can cover and fill the pores much better than a thick layer. The third reason for using a midcoat is its good protection against discolouration of wood ingredients. As this property is not always needed, we have made it easy for you. You can use our standard midcoats to ensure good grinding properties as well as excellent pore filling for wood species where you do not require special isolation.
If you are dealing with a type of wood with a high amount of wood ingredients, you can add our anti-tannin additive SEDIPAN WV 012 to transform our normal midcoat into an isolation midcoat. So all you need in your storage is one material and one additive, and not a variety of different midcoats.
TIPS FOR MIDCOAT AND SANDING
Do not sand the primer, sand the midcoat! If you detect too much rising fibre, check your woodworking machines or use our sanding primer.
Always remove the sanding dust before coating!
Use anti-tannin additive for isolation effect.
Use our special midcoat for larch to avoid the typical orange peel effect.
Stick to the drying times stated in the Technical Datasheet.