Base coat that can be sandblasted, it is used for wooden surfaces and is easy to apply. It is ideal for maintenance of artefacts in progress as it is based on distension and filling power that ensure a base coat film that permits adhesion of the finishing coats and their homogeneous and uniform film formation. It is formulated with solvent-based alkyd resins, which are suitable for painting systems of indoor and outdoor artefacts. It ensures good wetting of the wood pores with low swelling of the fibre, good sandblasting and a particularly flexible film that remains unchanged to dimensional changes of wood exposed outdoors. When applied by brush, it is particularly dilating.