La fonction principale de ces vernis, ou laques pour bois avec fonction mastic, est de remplir et de recouvrir les pores ou les petites imperfections que le bois peut avoir afin d’obtenir des surfaces uniformes et planes. En r\u00e8gle g\u00e9n\u00e9rale, les vernis d’\u00e9tanch\u00e9it\u00e9 polyur\u00e9thane ou les laques catalys\u00e9es doivent \u00eatre formul\u00e9s avec des agents qui facilitent le pon\u00e7age avec un maximum de transparence s’ils sont des vernis incolores, et avec une \u00e9lasticit\u00e9 maximale afin qu’ils ne se cassent pas si ce sont des vernis blancs. Ils doivent avoir une capacit\u00e9 suffisante pour couvrir ad\u00e9quatement les surfaces et \u00eatre rapides \u00e0 s\u00e9cher, car ce sont des couches qui doivent \u00eatre ponc\u00e9es avant d’appliquer la couche de finition de vernis, de laque ou de peinture.<\/p>\n
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