basic of painting

8/11/2019 Basic of Painting

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CLEANING AND PAINTING OFSTRUCTURAL STEEL

THE BASICS

Makrand Shinde


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SURFACE PREPARATION

BEFORE APPLYING PRIMER

Pre-Cleaning

(removal of surface contaminants

like sharp edges, weld splatter, rust,grease, oil etc)

Cleaning

Profiling


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SURFACE PREPARATION

Why is it so important?

Poor surface preparation is

the most frequent cause of

premature coatings failure.

Surface preparation is the

most important operation ofa painting project.


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Surface Contaminants

Types Loose Rust

Loose Paint

Salts

Dirt and Dust Oil and grease

Chalk

Removal Methods

Solvents Steam

Potable Pressurized Water


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CLEANING

HAND TOOLS

WIRE BRUSH

ABRASIVE PAPER (SIZE 3 OR 4) POWER TOOLS

WIRE WHEEL GRINDER

ABRASIVE BLASTING

SAND RECYCLABLE STEEL SHOT


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Cleaning Tools


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Cleaning Tools


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Cleaning Tools


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HOW TO APPLY PRIMER Make sure Mukand Approved primer are used eg:-Shalimar, Berger,

Chembond, Morson.

Proper mixture of Thinner with Primer depending upon Brush Paintingor Spraying Painting.

Clean off all loose paint, dirt and grease from the surface of your

metal.

Apply zinc-chromate primer(Synthetic Enamel) after ensuring all dirt,grease etc are cleaned.

Double coat with primer. Because metal is extremely prone to the

effects of oxidization, more primer is often better for the metal. Not

only will it help the top coat of paint stick to the surface, but will also

make the metal less vulnerable to the effects of time, especially rust,far into the future.

Recommended Drying time should be given before applying Second

Coat.

Good quality brushes of different sizes to be used. Small brush to be

used for painting corners and small openings


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Brush


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Don't Use This Type


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IMPROPER PAINTING


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Testing Of Painted Surface

We can chech DFT of any paint which is

applyied with DFT Meter

This are various types of testing done to checkthe DFT of painting

1) Pull Off Gage

a) Pen Type Coating Thickness Gageb) Pull Off Adhersion Test

c) Cross Hatch Adhersion Test

2) Electronic Gage


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Pull-off Gage A magnet is attached to one

end of a pivoting balanced

arm and connected to a

calibrated hairspring

By rotating the dial with a

finger, the spring increasesthe force on the magnet and

pulls it from the surface.

These Gage are easy to use

and are safe in explosiveenvironments and are

commonly used by painting

contractors.

Typical tolerance is 5%


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Pen Type Coating Thickness

Meter

It is Pull Off type

used to measure

Magnetic Steel

Surface Only .

Reading taken

where the magnetic

effect is lost Coatest make is

very cheaper and

easy to handel.


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Pull-Off Adhesion Testing

Simple to use, quantitative range giving adefinitive adhesion value, ideal for the

laboratory or field on flat or curved

substrate applications. A pull off adhesiontest determines the coating adhesion by

measuring the pull force required to

remove the dolly from the coating. Tensile

Dollies (or stubs) are glued to the coating

and, when the adhesive has cured, the

force required to pull the coating off the

surface is measured.


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Pull-Off Adhesion Testing Gages


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Cross Hatch Adhresion Test

Cross Hatch adhesion tester is a fast, low cost,

visual comparison method for paint and

powder coatings up to a thickness of 250m(10mils) in order to evaluate the coating

adhesion. The coating is cut into small

squares, thereby reducing lateral bonding,

and the coating adhesion assessed against

ISO, ASTM or Corporate Standards


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Cross Hatch Adhresion Test


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Electronic Gage

It can be used to measuredeither magnetic steelsurfaces or non-magneticmetal surfaces such as

stainless steel or aluminumusing a digital coatingthickness gauge


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Video's

https://www.youtube.com/watch?v=FMYZYoSB0g0

http://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.html

http://www.youtube.com/watch?v=5RPoBzQBh

a4

http://www.youtube.com/watch?v=S3so3ktUA8E

General Painting Procedure Video

Cross Hatch Adhersion Test Video

Pull Off Adhersion Test Video

Pen type Testing Gage Video
https://www.youtube.com/watch?v=FMYZYoSB0g0https://www.youtube.com/watch?v=FMYZYoSB0g0http://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.youtube.com/watch?v=5RPoBzQBha4http://www.youtube.com/watch?v=5RPoBzQBha4http://www.youtube.com/watch?v=S3so3ktUA8Ehttp://www.youtube.com/watch?v=S3so3ktUA8Ehttp://www.youtube.com/watch?v=S3so3ktUA8Ehttp://www.youtube.com/watch?v=S3so3ktUA8Ehttp://www.youtube.com/watch?v=S3so3ktUA8Ehttp://www.youtube.com/watch?v=5RPoBzQBha4http://www.youtube.com/watch?v=5RPoBzQBha4http://www.youtube.com/watch?v=5RPoBzQBha4http://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttp://www.directindustry.com/prod/defelsko-corporation/coating-thickness-gauges-magnetic-pen-type-24088-450567.htmlhttps://www.youtube.com/watch?v=FMYZYoSB0g0https://www.youtube.com/watch?v=FMYZYoSB0g0https://www.youtube.com/watch?v=FMYZYoSB0g0


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basic of painting

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