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Zinga: Trouble-Shooting Chart




1. Zinga does not dry  The incorrect solvent was used for thinning  Discard all suspect Zinga, and begin again with new Zinga from unopened tins
2. Zinga dries but goes rubbery in places  It was applied over an old coating  Re-blast the entire affected area and check that a surface cleanliness of SA 2.5 has been achieved before progressing any further.
3. Zinga ‘cobwebs’ when being sprayed by conventional spray-gun  The Zinga has not been thinned correctly  Make sure that the Zinga is thinned approximately 5% with Zingasolv
4. Zinga has an ‘orange-peel’ appearance and also sometimes dries slower
 The Zinga was applied too thickly, or was not thinned correctly  Dilute the Zinga +/- 5% with Zingasolv and apply 2 or 3 thinner coats
5. More Zinga than estimated is being used  The blast profile is too deep  Change the blast-media to the correct grade before proceeding
6. Less Zinga is being used than estimated  The Zinga has been over-thinned  Use new Zinga from an unopened tin, and dilute it with the over-thinned Zinga
7. Excessive misting developes when spraying  The Zinga has been over-thinned  Use new Zinga from an un-opened tin. Dilute it with the over-thinned Zinga
8. After drying the Zinga can be easily removed  The steelwork was not blast-cleaned, or was not given the correct profile     Select the correct grade of blast-media and re-blast the entire area
9. After drying, the Zinga coating remains ‘cheesy’  The Zinga has been applied over oil or grease.  The affected area must be thoroughly washed down with strong detergent or a steam lance, and re-blasted
10. After UHP-blasting the Zinga displays poor adhesion qualities  The original blast-profile, it there was one, has not been sufficiently exposed to provide a ‘key’  The entire affected area must be re-blasted, with either grit or slurry, and the blast-profile depth checked before any subsequent coatings are applied
11. After being coated, the steelwork displays a patchy appearance when viewed obliquely  Either the Zinga has been over-thinned or the blast-profile is too deep.  Check the viscosity of the liquid, and apply subsequent coats until the patches disappear
12. A topcoat over Zinga forms blisters or delaminates  The top-coat has been applied too heavily, causing solvent entrapment  Remove the topcoat (and Zinga if required) and re-apply at the correct dry film thickness
13. A topcoat remains cheesy after application onto Zinga  The top-coat was an alkyd enamel  Wash off the coatings with acetone and re-blast the whole affected area.
14. Powder-coating displays pinholes after the baking
schedule has been completed
 The Zinga coating was not given sufficient curing time  Re-blast the entire affected area and re-apply both coatings. Pre-heating the steelwork helps drive any trapped solvents
15. Over hot-dip galvanizing, the Zinga layer breaks away The HDG was too new to be over-coated with Zinga Ensure that all passivation has been removed and sweep-blast the HDG at a pressure of 60 psi
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