Fig 5.10 Paint Flake

TM 5-5420-279-23

(9) Rust Staining. Red and yellow oxides produced from ferrous metals show as rust stains

on what appears to be a reasonable paint surface. In fact they indicate that small fissures

have developed and the metal substrate has begun to corrode. This fault should be cleaned

down to the substrate.

(10) Flaking or Peeling. This fault is the most easily confused condition. Paint is caused to

flake by numerous conditions, some of which are avoidable mistakes in application or

pretreatment, and not, as commonly thought, by deterioration in the paint film. In all cases

where the paint film adhesion has deteriorated so that the paint is lifting and flaking, the

extent of the damage and the general condition of the entire component must be considered

before a repair decision is made. If the damage is very localized, the affected area only

should be repaired in the form of patch painting. But in the event of a general deterioration,

for example upwards of 10% in patches of the total surface area, localized repair would be

false economy and a complete re-treatment should be authorized.

(11) Fig 5.10 shows the underside of a paint flake contaminated with rust, oil and chalk.

(12) Fig 5.11 shows a flaking paint system caused by the omission of primer pretreatment.

(13) Fig 5.12 shows a badly flaking paint system that requires cleaning to a suitable

substrate and renewal of the paint system. This illustration is a direct extension of Fig 5.9

where the paint was blistered.

Fig 5.10 Paint Flake

Change 1 5-9