paint reliability factors

Reliability factors for paint:

Relative importance factors, determining the reliability of a paint system, have been proposed for different elements of the paint coating process (this work was reportedly initiated by Sir J.F.H van Eijnsbergen, well known in the field of duplex coating systems). The following (subjective) factors pertain to painted steel - a different set of factors apply when an additional hot dip galvanized coating is applied before painting:

Parameter	Relative Importance (painted steel)
Surface condition:	4
Surface preparation:	8
Humidity/dew point:	8
Coating chemistry:	8
Applicator skill:	4
Curing conditions:	1
Transport/handling:	8
with the (logarithmic scale) factors meaning: 8 - very high importance, dominating 4 - high importance, dominating 2 - significant importance 1 - equivalent to other parameters 0.25 - minor significance 0.125 - little or no significance

The proposed surface preparation factor remained high ("8" rating), when an additional protective galvanized coating is applied to the steel, prior to painting - but the other factors decrease significantly as a result.

Reference:

The "Z" Files, Data Sheet No. 10, Industrial Galvanizers Corporation Pty Ltd.

Links:

Main components of a paint coating

Avoiding paint failures