Multiple Coat • Acquire and read all product data sheets

8.4.2 Multiple Coat • Acquire and read all product data sheets

for specified coatings

In most cases, a multiple-coat system is used

• Take training about unfamiliar materials

in industrial and marine coating work. There

from coating manufacturers and/or unfa-

are numerous reasons to use a multiple coat-

miliar testing equipment from its manu-

ing system. In many cases certain materials

facturers

do an excellent job in one aspect of corro-

• Review the specification and communi-

sion protection but not so well in other areas.

cate with the owner if you find inconsis-

The most common system uses IOZ as the

tencies, or conflicting and/or incorrect

primer, mainly because of its excellent adhe-

statements

sion to steel and its ability to provide

• Confirm and document that the submitted

cathodic protection at cuts, thus reducing the

coatings match the specification

likelihood of undercutting corrosion. The

• Confirm and document that the colors

second coat is normally a high-build epoxy,

submitted match the specification

used as a barrier coat to reduce moisture

• Confirm and document that the coating

penetration to the substrate. The final coat in

contractor has all certifications specified

an exterior system is typically polyurethane,

by the owner or required by international,

used for its excellent resistance to UV.

national or local regulations • Confirm and document that the craft

8.4.3 Compatibility

workers have the certifications that are specified

Not all coatings work well together! A clas- sic example is applying an alkyd coating

• Review coating contractors’ plans for storage of coating materials and confirm

over inorganic zinc or galvanizing; the high

they meet national, local and owners’ fire

PH of the zinc forms a soap like material.

and environmental regulations

The fatty oil in the alkyd reacts (saponifica-

• Review the contractors’ equipment plan

tion) between the two coatings. Some alkyds

and confirm that he intends to use the cor-

modified with phenol prevent saponifica-

rect application equipment and procedures

tion.

as required by the specification and the coating manufacturers’ requirements

Another common mistake is applying a chemical-cure coating over a solvent-evapo-

• Confirm that sufficient quantities of coat-

ration cure coating. The strong solvents in ing materials have been ordered

Coating Types and Curing Mechanisms 8-15

• Confirm that all the required testing

8.4.4.3 At Application Start Up

equipment for the project are at hand • Confirm and document that all surface

• Test all of equipment (including PPE) to preparation has been accomplished and ensure it is in working order and all spare

that the surface meets the required clean- parts and batteries are on hand

ing standard at the time of application • Set up any computer-related documenta-

• Confirm and document that environmental tion system needed

conditions are within the range for the • Arrange for any laboratory testing of sup-

material being used

plied coatings required by the specifica- • Inspect and document that all required tion

masking is in position and in working • Be aware of all environmental and dis-

order, report any problems to the coating posal regulations

supervisor prior to application • Inspect and document that any required

8.4.4.2 Upon Arrival of Coating

environmental controls are in place and

Materials

working properly, report any problems to

Confirm that the materials received are the

the coating supervisor prior to application

approved materials:

• Confirm that materials brought to job location from storage are the correct mate-

• Document the overall condition of the as- rials and colors for each phase of project received materials

• Observe and document the amount of • Document the batch numbers as printed material and batch numbers of material to on each unit of material

be applied

• Document the date of manufacture and • Observe and document that the correct reject any material past its shelf life components are being used for multicom-

• Confirm that the thinners and cleaners

ponent materials

received match the technical specifica- • Confirm and document that the equipment tions from the coating manufacturer and to be used is the correct equipment for the any special requirements of the owner

application

• Draw samples to send to laboratory for • Confirm and document that equipment set testing if required by specification up meets owners’ requirements

• Confirm that sufficient quantities of all • Observe and document any approved por- materials have been received tioning of the materials

• Confirm and document the storage condi- • Observe and document the mixing of the tions and temperatures

materials

• Confirm and document that the storage • Observe and document the addition of any conditions meet the coating manufactur-

thinner

ers’ and owners’ requirements and any government regulations

• Observe and document the visual appear- ance of the mixed material and report any

• Confirm and document that the necessary irregularities to the project supervisor components in the correct quantity are before the material is used available

• Observe and document any required • Confirm and document that the correct

induction time

colors have been received

8-16 Coating Types and Curing Mechanisms

• Observe and document the beginning of • Test and document the DFT of the applied pot life if necessary for the material in use

material after it has cured and in accor- • Review your test equipment instructions

dance with the specified procedure • Check and document the calibration of

• Test (adjust if necessary and allowed), your inspection equipment

confirm, and document the accuracy of any gauges you use at the beginning and

the end of each shift • Observe pot life during application and

8.4.4.4 During Application

• Perform any other tests such as hardness, report to the project supervisor if the

color, or gloss that may be specified material has reached the end of its pot life

• Observe and document any repairs to the • Document the use of any material that was

coating system made necessary by your applied after the end of its pot life

inspection

• Observe and document application of

8.4.4.6 At the End of the Project

material, report any observed problems as soon as possible to the project supervisor

• Observe and document the cleanup of the

project site

• Check and document wet film thickness if required

• Document all materials left over and how they are to be disposed of with regard to

• Observe and document that the applicator regulatory requirements checked WFT at regular intervals during

application • Complete and deliver all reports • Visually check application for equipment

problems and workmanship during appli- cation

• Report any observed problems as soon as possible to project supervisor

• Document all observed application irregu- larities and how they were repaired

• Check for holidays, pinholes and other irregularities of the applied material as soon as reasonable during and at the end of the application

• Observe and document time frame and environmental conditions between each coat

• Inspect the cleanliness of each coat prior to application of additional material