Document zo6KBVM0y3k0oqbMNEegN6Obn

623..-702 Product * 4 A* hf 16*53 Mr* G* ft* *. Markle, Lab. Mr* K* C. Lampsrt, Lab* Mxv Stuart Graces, Lab# Mr*. 0* ?f. 'Tissari, Lab* LABORATORY LIBRARY Philadelphia Laboratory February 3, 1950 MMCRAKDOM r e p o r t ;#M~28 3 . ; - .-A# C* HIDING OVER SEALED SORFAClffi1 TOWN & COUNTRY HIGH . HIDING ELAT, (621-702 ) . . An .informal complaint was made on the .biding 0 621*702 by Mr* ' Blackwell (painting contractor) and Mr* People a' (Manager'-- .. . MaMaellers paint store) Mr* Blackwell followed, bar label, cllrecti;on8 MIf the surface is porous apply du Pont Primer sealer"* A laborer tpry . s't'ady arising from this complaint Has shown.that sealed sur- faces' return less biding than porous surface^, Competition doe's not recommend, sealing prior to application of p^e coat flats* ,?)e should consider changing .our recommendation quoted abate .'to read *'t'ben flab'is tinted seal surfacte with du Pont Primer Beal er'Tl,'* Dsth11s;. Hi st ory ...of Te3t ! ' This was the first time Mr* Blackwell bad' used. 6.21*702! as it had just recently been released* The Celling was painted'5;years ago with our white flat* The ceiling was one which Mr*' Blaokwell and oar salesman- Stacey Jones, judged could be done with one coat of .47 flat and would yield a good job with one coat of any'of the com-' p.etitiv flats* . The celling was primed with a mix of-Primer Sealer add 47 flat (375-8.47).; In applying.621-702 (B#834236) {B#834327) .no reduce tion was made for the first portion of -the Ceiling^ .'pLen. the', painters complained of beany brushing, the paint was reduced to- proper -paint ing. consistency* ' laboratory Testa . A retain sample of Batch #<S34236 whs found to/hide 9'40. sq0- ft*/gal; at a contrast ratio of *917*- ' -This is up to standard* . A qualitative comparison-of this batch with-#834327 shbwed the''latter to be up to standard also*'" . '' ; '- N35404 ,'6;2L-7Q2 has mote hiding 9&m)t ~<?ire ;4'.p0ftdu6t'fcu?fac than it. lias bveb fe sealed surface*' A pa$ei. ms prepared witha' darts', porous substrate adjacent tp a 'comparatively lightexsealedsub.- strata o' This gives the sealed surface an advanbaga ever the porous aiii^!api?.'..;5Jhe i>aiiel was coated wittt 621^702 re^aced for broshiag# The`ip^t-0 jhid'ing over the darker porous hubatrata-ita'easily seen by eyti.-gt&d' refleotometer readings are listed' below* / . Subst?i|Ette brigbtit.as3 621-702 brightness Porous aUh'strate .vSpeecWilasy},' Sealed .surface'--{Ovulite} White.bn whit '., ' 54o^: r;eflectanoe 64*5$. reflectance 6lo5^/- " " B.2o? " , '85i4 ' If-the sealing coat, ha4 b^n omitted, too Blae&weil\& worfe at thd'dillac displa3r room [might have been acceptable^ The following -bompetitofs* labels contain no recommenda tion for' sealing -except, spactle . spots although holdout tests. :shbs? that they have;- {where indicated);'poorer holdout thbn 621-702. Holdout B,P,S,,-. Flatlux Pittsburgh Wallhide Nat' lc Lead co*~Wonsover Sonneborne londercoat Valoa Benio 'Moore Saalflat* SR-4 3161 SR-42107 'SR-41623 SR-41641 SR-416S5 Fair Bad -- Bad Poor TafF "Good'" * -Beni* Moore; does recommend a-.3 .coat system for new plastered walls o The; first ooat is primer sealer-i, 'W3t-j4vs- DUP030003174