Flash Rust

Example of Pressure Wash on Moderate Flash Rust

Posted on 16. Mar, 2009 by charles frenzel.

Example of Pressure Wash on MFR:

Below: the substrate is dry- but it is  darker (overall) than the original substrate.
This surface is dry within 5 minutes. The standard pictures in VIS-4 do not provide these types of illustrations of pressure-washed surfaces. The upper half is not washed; the lower half has been pressure washed.

Brush test on [...]

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Pressure Washing and Excess Flash Rust

Posted on 16. Mar, 2009 by charles frenzel.

What Happens if there is too much Flash Rust prior to painting?

 Prior to the application of paint, the substrate must meet the procurement specifications.
 Typical field remediation includes:
 Pressure washing
 Broom brushing
 Blowing off with pressurized air
 Solvent cloth or dry cloth wiping
 Vacuum
Upon polling contractors, it appears that pressure washing is the preferred practice. The appearance after pressure washing when [...]

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Summary of Wipe, Swatch, and Brush Methods

Posted on 15. Mar, 2009 by charles frenzel.

Core Idea: All Methods lead to the same conclusion.

 None
 Light
 Moderate
 Heavy
Adopt the method with which you feel most comfortable and that is portable to different projects and sites.

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Summary of Brush Test

Posted on 15. Mar, 2009 by charles frenzel.

Summary- Brush Test:

 Brushing flash rust is quick, simple, and very reproducible.
 Adopt a standard brush and standard cloth.
 Be consistent with one swipe and in the same direction and duration.
 Practice brush strokes with even pressure
 Keep the contact area consistent.
 Cloth can be cut at the area of color transfer and placed in permanent file or scanned for color.

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Different Areas with Brush Test

Posted on 15. Mar, 2009 by charles frenzel.

Comparative results:

Heavy Flash Rust formed from water coming from holes.
Different section where Light, moderate, and heavy flash rust had formed in close proximity.
 
 
 

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Example of Moderate Flash Rust on Brush

Posted on 15. Mar, 2009 by charles frenzel.

Example of Moderate Flash Rust on Brush:

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Example of Brush Test on Light Flash Rust

Posted on 15. Mar, 2009 by charles frenzel.

Example of Brush Test on Light Flash Rust:

This view has the sun Illuminating the surface.  Substrate appears darker as it is in shadow. Inspection is biased by lighting angle.

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Brush Wipe Procedure

Posted on 15. Mar, 2009 by charles frenzel.

Brush Wipe Procedure

This method was developed by Todd Pacific Shipyard. These photos are courtesy of Todd Pacific.
 Sweep the surface with a Cloth wrapped around a brush
 Standard cloth and standard brush.
 Wrap cloth around a paint brush. Swipe the cloth across the surface.
 Define the amount of pressure
• Brush as if painting a door
 Define the amount of contact- single [...]

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