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Application & Coating Defem

C O N T E N T S

ADHESION FAILURE ...................................................... 6-3 ALUGATORING ..................................................... 6-6 ALUMINIUM CORROSION .............................................. b7 - BllllNESS ................................................................. 6 4 BLEACHING .................................................................. 6-9 BLEEDING .................................................................. 6-10 BLISTERING ............................................................... 6-11

- BLOOM ............................ ..................................... 6-14 BRIDGING ................................................... "...-..-." 6-15 BRUSH MARKS ........................................................... 617 BUBBLES or BUBBUNG ......................................... 6-18 CHALKING ....................................................... 6 - 1 9 CHECKING ..... - . - . - "" .............. 6-21 E

-e; CHEESINESS ..- -.-.- ........ - ..-.....-.... -........I.......... 6-24 CISSING -.,..... " ... "................... , ......................... 6-25

< .. COBWEBBING ............................................................ 6-26 - = CRACKING .".-...... "..... ......................................... 6-27 CRATERING .............................................................. " 6-30 CROWSFOOTING ................... .. ................................ 6-31

. DELAMINATION .......................................................... 6-32 DRYSPRAY ................................................................. 6-34 EFFLORESCENCE ....................................................... " 6-36 EROSION .................................................................... 6-38 FADING ...................................................................... 6-40 FlLlFORM ............................................................ 6 - 4 1 FLAKING ................. - .......... ................................... 6-42 FLOCCUVTION ......................................................... 6-44 FLOODING .- .................................................. 645 FLOTATION .... ,.. ................................... . . 6 - 4 6 GRINNING .. " .... ..................................................... 647

Application &Coating Defects

A D H E S I O N F A I L U R E sealsodelaminnionand Raking

Application & Coating Defects

A D H E S I O N F A I L U R E seeatsodelaminationand Raking

Olkr exomples ore rhown on the lollowinqpuqe

Dcxription: Paint faik m adhere to rubstme or unklying maa of paint.

Rmntln: Ensure that the surface is clean, dry and free ham any contamination and that the surface has been suitably prepandlkethecomRcwtingspeciRcation.

*I: Depends upon theextent ofadhesion failureRemwal of defective areas will be necessary prior to adquare preparation and application of comamaring syrtem m manufacturer's recommendatiom

Applicat ion & Coating Defects

GRIT INCLUSIONS .................................................... 6-48 GROWTH ................................................................... 6-49 1

...................................... INCORRECT COATING SYSTEM 6-50 - IMPACT DAMAGE ........................................................ 6-52 LAMINATIONS o r SHELLING ......................................... 6-54

............................................ MISSES/SKIPS/HOLIDAYS 6-55 I MISSING TOPCOAT ...................................................... 6-56 MUD CRACKING ...................................................... 6-57 -

Applicat ion & Coating Defects

A D H E S I O N F A I L U R E rpealrodelaminationandflaking

~ . ,-?,I ORANGE PEEL ......................................................... 6-58 w-:--z~,:, ;~: OVERSPRAY .............................................................. 6-60

2 L ;;-. . - , ;- ,& PEELING .................................................................... 6-61 *. PINHOLES .................................................................. 6-63 2 ~~ ~ - RAIN DAMAGE - WATER SPOTTING ............................ ..6-65 *

0- RIPPLED COATING ...................................................... 6-66 G

Y ROT ........................................................................... 6-67 3 RUNS or SAGS ............................................................ 6-68 $ RUST RASHING .......................................................... 6-71 = RUST SPOTTING ....................................................... 6-72 RUST STAINING .......................................................... 6-75 SAPONIFICATION ....................................................... 6-76 SETTLEMENT ............................................................. 6-77 SOLVENT LIFTING ...................................................... 6-78 SOLVENT POPPING ..................................................... 6-80 TACKINESS ................................................................. 6-81 UNDERCUTTING ......................................................... 6-82 WATER SPOTTING ....................................................... 6-&1 WRINKLING ............................................................... 6-85 ZINC CARBONATES ..................................................... 6-88

Applicat ion & Coating Defeas

A L L I G A T O R I N G (also LnownasCrModiling)

Denription: .er, aq? mac10 ( n i b n? :r :racvn; dn : l r? l imc? I i th?:rn t l a n a ~ a ! o r ~ r c r ? o ? i ('t:.lra, ceierrat? ? through tothe unbercoatdown to thesubrtrdt;.

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PrabableCauses: Internal rtresses in thecoai~ng where thesurface rhrinkr faster than the bodv of the Daint film Can be caused bv i z c n r .:I ~ i r (Arrant' mteapan~il:r c t j :rb 11,rac~ 38 n t i m:na. naar:? .nl?lcoit A t i 3nar1 topcoat

hevention: Use correct coating sp?cification and material$. Avoid excerrive thickness. Avoid application at high ambient temperatures

Repair. Repa~r wlli depend upon rlze and extent oiali~gator~ng Abrade or remove all affected coats and apply ruitable undercoat and roDcoat Followrecommended a ~ o l r a t ~ o n procedures.

Application & Coating Defem

ALUMINIUM CORROSION

Application &Coating Defects

BLEACHING seealsohding

Daoption: Blistedngofthepairncoatingduetoaluminiumcorrmion productundw the paint.

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Pd!abIe(auwr: Pinholes in the coating. Porosity of flame sprayed alum~nium. insuff!tient coating thickness.

Prevention: Use c o m i y formulated coating system applied in the corwrthicknen.

Repair: Blast cleanand recoat

Desaiption: Toul l0~~0fc01ourofa coating.

PWableCau~~: Bleaching due to weathering or chem~cai anack

h a t i o n : Use colour stable pigments or a system whlch wwlil withstand the chemical environment.

Repair: Remove bleached coating or abrade and recoat using a moresuitable coatingsystem.

Application & Coating Defects

BLISTERING

PmbableCaurcr ~l i i lorrofadherioncaused by contamination with greapoil,sirs,w%uapped maisture,retained solvent, hydmgen~p~ulprers~re(On coaoatingsured withcathodic protecrion).soluble pigments etc.Osmotic blistering can alu, occur in immersed comlitions.

Rmntion: hurecorieasu~ceprepreatlonandapplication.Apply a ruaabie coating system.

Repair Depena ng upon sue and type of b~lnerlng, remove blinecedareas or entrecoatingryaemandrepalror h l b

Appli ion & Coating Defects

CHALKING L

Appli ion & Coating Refects Application & Coating Defects

CHEESINESS (SokCoatingl

kcription: (oatingremains sofr,evenafterpmlqrddrying time.

Rehblehrer- Wmng mixing ratioforwpackpainnToolowadryingi cunno ternoeraturEucwiwroIvent retained within the coating

Pnnmion: Enwr~adquatema~ngoftao-paccpa~nrr.On~wthe recommended amoJrn of m.nnen. Apply and cure the mating under controlled envimnme&l&ndiiionr

Repaic RemwealisoftcoadngraapplywitaMecomingryrtwo or toptoatto coatingrnanufactun~recommendatiom.

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