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la put Had lead Technical lottere, the Had lead Teehaleal Ccaalttae of the load Indutrlaa iaaoelatlen Am ecnfload Itaelf to the raawndatloa of rod load paint* aad baa b ft other eonaldcretlone Involved la painting to bo dleoovered ly tho maor tram otbar aoureoe, Jbe extreme laportame, boeever, ef mrfeoe prvroretloo tor tbo proper performance ef any aotal protective palate, baa aom lad the Committee to propara tba reeowendatloei contained la thla Technical latter to eld tbo lndwtrlal uaar la getting tba aoat oat of hie palat, The aaooaaa or failure of a paint gyaten, after all, vary often depeoda open tba adequacy of tba eurfaoe eoodltlona. An excellent paint will fall quickly over a dirty, llX-prapared eerfaoa Wile a leaaar paint aay do veil error a eerupnloaely olaaa aurfaee. The atrlagaaay of preparation rvqulr--enta, then, earlae with the type of palat wade
The rect--enditlone oontalaad la tble Technical Latter are lataadad to aid la tba proper determination of need and aeleetion of tba proper eathod of anrfaaa preparation* Slagily, tbay are a listing of surfae# preparation requirements la reference to a nuaher of palatine eondltlooa far Wlob red land prlatre are tmf- tested, formulas for all the palate llatad are contained fa preview ted Lead Technical lettare (tbeae am arailable, at ao charge, open request to tbo offlooa of tbo Association),
This Technleal Letter alao lnelndao a abort dlaowaioa of aerfaoo preparation to aaphaalan tba dlffemaaaa and eo^>latanaea of turface contaminant removal by tba aoat eidoly wad aetboda ef surface preparation. ? Inquiries on tba eentanta of thla latter or on opadflo painting prabl-- are eelaona and should be addreeaed to tba load Industries Aaaoolatloa or to tbo designated Individual* la tba cooperating oonpanlae llatad baloow
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IS* roaaoa for aurfaoa preparation My to* atat*d tlnply *nd wholly la tan* of adh*ronoo of th* paint flln* Thl* phoneMoon ooaolat* of aolacula? attraction of paint and *urfac*, proparly oallad adhaaion, and nachanical anehcrlnf to r*la~ tlvoly rou'h aurfaoo, oallad boatin'. Paint will fail in dlrwct proportioa to tbo lack of adhesion and toondlnt* Any dirt* oil, treaae, aalta, mat and othar fertipn attar *111 hindar odhaalon op Vo th* point of Mldnc-yood pointin'' lapoialhla. b> oopt for nut, tb* ooctsatoacta praweot oottlnt of tb* Mtal whitfc 1* tb* aaaantial of adhatloe* Rart, hll* it can to* paintad oa*rf form aeal* which aeontaally lift* off th* aurfaoa takint tb* paint with lt LlkowlM a eonplataly Mootb turfao* ll oxtroaaly difficult to paint* Surfa*** to to* paintad, tharaforo, anat to* fr** of adharlon retardin' aubatanoaa and th* aurfoca* thcMwlvaa aoat prowlda at l*a*t on* datrw* of Mohanloal anchor*
*sur t o coKsim n Mucmn & renwo cr sovicz mruunca
Proouaditf a daoilloo baa to**o aad* on th* aattar of accxvaqr, *Meh, in rela tion to aurfao* praparatloe mat to* eoaaid*r*d in tara* of th* total axtaeaioo of paint fila Ufa, th* qoaatioo of Mlactlac * Mthed dapanda on thra* factor*
1* Condition of tb* aurfao* toafor* praparatlon* t*. Practicality, toaoaaa* of phyoloal oonUtlon, of oaln* a particular
Mthod. 3* Tb* typ* of paint ahloh la to to* applied* 1b* flrat taro *oo*lderation* ar* aaally understood, Tb* third may p*rh*p* to* amplified. boat aaaantially th* adharone* of paint, *a lndl*at*d aboro, la * Mttar of it* tmttia* ability* Th* r**uir**ant* for aurfao* preparation, therefor*, ar* or* *T*r* a* th* wattin' ability of paint* d*cr*aa*a* Ch* reason wtoy tb* straight
rod load in llnaaad oil paint, 1*1*1* fonul* 1-1 (th* iih u fad, Spao. TT-P-Wa,
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3 Typa I, or 83PC Paint 155T) or lta mo t aqplvalent, haa aohltaed M aln*nt poai
tian la tha palntla* ot atael la that lta aoparior oattin* oharaetarlatloe Mka It poatibla to bo naed orer atool ahara foil aaoonta of rut and tlfhtly adharaat adll aoala an preoont* Booh a aorfaoe Conditlaa la often tha boat that oaa praetloally bo obtained la tho field, The ecrreeloo inhibit!* rad load pltaant, of oonrae, ooBtrlbotaa to thia advaatafeooe ebaraetarlatla*
the ilnaeod<fd1 aahlola, boatvar, la dct drying and It la often aaoaaaary to oaa a faator drying cdWeata aahlele prlnar, aoeh aa L.I.1, Pomelo 6*7 (TT-P-Ma, Typa IX), Snob a paint la Hadtad la lta aattlnt ability If tha praaaaoa of ayatbotla raaina, Therefore, arfaoea noairint palata of thla typa Boat ba cercfttlly alaarad of all eorroaloa prodoata and eontandnanU,
Vdm atill farther, paintin' mpiiraaanta My naoeaaltete tha aa of the wiy rapid drying ayathatle aahlola typa palata, each aa L.IJU foraalaa 3-7, or
9 6-13 (TT-P-86e, Typa ni) r 6-16, H1-M75W {Ba 3Mpe Paint Pomola la. U6),
tbaaa palata are aaafal d assailant bat only on the aoat earefally praparod aorw foeca ao that thay m? only ba uaad ahara a hlfh decree of olaaday la praatloal or oa faetory-fabrleatad eqalpnant,
Vlth thoaa aonaldaratdcna la mind, tha aorfaaa proparatloo of ataol rwai aaadad for rad lead paint foils**.
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1cramoet of tha oajor faster* to bo eonaldtred In mainterano* of any metal
protective paints art oorfao* preparation and tha condition of tho tttrfaoo at tha
tlaa of application. Other factor* which contribute to tb* **rrio* of each paint*
ara tb* oharactar of tho baaa natal, tha environmental uxpo*ur* and tha extent and
kind of Mobanleal Injury.
Baoaaa* of tb* primary Importance of *urfao* proparatlon la it* rolatlon to
a paint yitca'a pr.-tcetloe aal a-i-rioe, It baa claimed tb* attention of paint aana
factor*ra, contractor*, punatroetlon md milnWiinec cnrlm-cr* and all lndo*trial*
public and privet* user* of natal protective paint.
Tho Ufa f rwl I* id pilot, therefore, 1* tor*rood by tb* condition rf tb*
* Mrfco* at tb* tla* of applloatlon 'daapit* It* leh*r*nt *tr*n*th. It* Impermeability to water and ga**a, It* anticorrosive character and hl-h raalatano* to wwatbar *-
Integration.
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OUy thee* *urfao* preparation method* which ara pertinent to atroetaral atael
cleanin' m>d wbdeh ar* neat **n*relly *ad ara considered la tkla technical letter.
Tha major method* of *urfao* preparation of at*al may be clasted under two cate^orl***
1. Mechanical or physical surface preparation
a* Band cleaning
b. tower tool cleaning
o. ELaetlar, *and- or hot-blamting
d. flams cleaning
2* Chemical *urfao* prepsratios
a. Cetreealog
b leathering
a, Oemloal cleaning
l Ilkall cleaning
I* laid oleeadng
). tickling
li. fhoephat* *l<ultf
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0 of rurfaeo preparation* Dio oot earnoa aarfao* ocntk*ln*nt am -r***olik* oreid* ubatanoao, oxidation product* nob u Rill foils, raUr, uat provloa* paint MtU Zb# parfcntano* afforded \f m applied paint in jrlnarlly dependant open the ltefn> to lfcleh tha aorfaot cant--inset* bar* boon mtnii and tha ptgrtleal condition of th* natal aarfao* at tha tin* of painting. for tha graataat **rlea tha laportano* of Intinat* ooctant, (--ttla), bat--on tha hata --tal and tha prlna ooat cm not ba o--ranphaalaad. Bo mb, lathi proparatloo of structural ataal ecnptotene** of tha mnoval of aurftnc ocatanlnanta la ayeonj-- to long aarrloa Ufa. Trot--..lilac erg-tain nbata--u* pro--at dlroat contact bat--an tha --tal aarfao* and tha prlaar paint and tha* pro--at maxim adhesion* ittar not only rod--a tha adhaalon hat--an tha natal MrfiN and tha painty bat alo pronotaa tha for--tlon of oorroalon product* under tha flln. th#
9 real, taint hydroaeoploy oetrapa aoistur* ohieh aeta aa an alactrolyt# In pro--rtlng rapid alactrocfc--leal eorrorlon through otthodle mat 1a contact dth tha anodla natal aarfao** XriX.8ClS Mont ttmetural ataal la hot --rfcad* Zt is oo--rad oltha nlxtur* of Iron caddaa aallad ad11 aeala aMdh la of --rlabla thleknaaay continuity, and adhaalcn lb* variations la tha Bill aoala ara dependant prlnarlly open tha shape, croaa aactleny rolling tanpara.oraay nd subsequent amber of rolling and annaaline** Hill aoala la brlttla and la --Inly nagnatio Iron codda, P*^. Dm to the dlffaranoa la --ffldant of expansion bat--an tha adll aoala and tha baa* natal* It oraeka* '*>an first for--d on atraetural at--1 It 1* bright and alnoat all--17 in appear*--, hat on axpooor* to tha ataoaphar* it aoqalra* a blua-gray oolor* If nolaVara enter# a Bill aoala eraok, matin* of tha baa* --tal c o b--on*#,
0 la tha mat or--pa under tha adll aoala, adhaalon la daatroyod, partially da* ta
iMmaaad --la-- of tha mat o--r that of tha baa# --tal* th# mat if n prodnat of ahotreohanUol aotlon bat-- tha aathodie mill aoala areas and tha adjscant
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