Optimizing gray primer in multilayer coatings

B - Operations – Transporting – 05 – D

Patent

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B05D 1/36 (2006.01) B05D 5/00 (2006.01) B05D 5/06 (2006.01) B05D 7/14 (2006.01)

Patent

CA 2254874

An improved method for applying multiple layers of coating compositions on a previously painted substrate by first applying a primer coating and then applying over the primer coating a top coating that matches the color of the painted substrate at less than complete hiding to achieve a color match of the top coating and the previously painted substrate; the improvement used is to apply a gray or white primer coating at complete hiding having a reflectance in its dried state essentially the same as the top coating measured at the wavelength of minimum absorption of the top coating.

L'invention a trait à une technique améliorée d'application de plusieurs couches de compositions de revêtement sur un substrat ayant déjà été peint. Cette technique consiste à appliquer, tout d'abord, une couche primaire puis, à appliquer sur celle-ci une couche de finition qui soit à la teinte de la couleur du substrat peint lorsque le masquage n'est pas total, afin d'obtenir une égalisation des tons de la couche de finition et du substrat déjà peint. L'amélioration consiste à appliquer un apprêt gris ou blanc, en cas de masquage total, dont le facteur de réflexion, mesuré à la longueur d'onde de l'absorption minimale de la couche de finition, est sensiblement identique à celui de la couche de finition lorsque cet apprêt est sec.

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