Western Pine Associolion's New Primer ond Knot Seoler Releosed to Monufqclurers

Portland-The Western lrine Association research laboratories here announced the development and release to approved manufacturers of a special formula for making a conrbination primer and knot sealer to be used r.l painting knotty grade rvoods. The formula, designated WP-578-P, is a further development of the universallv-userl clear sealer WP-578 the laboratorv released for manufacture several years ago.

The nerv formula eliminates one step in the sealer-primer-paint sequence heretofore necessary t,,hen painting knotty gracie u'oods. Norv the primer and sealer may be ;rpplied in one application. The knot sealer u,as originally primer opplicotionr into one. developed to prevent knot discoloration burning through painted surfaces, and hence allows increased use of exterior Economy siding and knotty grade paneling for painted use.

To date, the ialtoratory reported, approximately 20 manllfacturers have indicated they u,ill produce tl.re nerv f<trmula ior national distribution. About 50 are producing the original, clear sealer. Information concerning names of marr_ tufacturers of both the clear sealer ancl the primer-sealer may be obtained by rvriting the Western pine Associatioir. 510 Yeon l3uilding, Portland 4, Oreson.

KOPPER.S CONAPANY. INC.

Wood Preserving Division lllS Wilshire Blvd., los Angeles 17, Colifornio 55 New Monlgomery 5f., Room 819, Son Froncisco 5, Col.