Fig 5.9 Paint Blistering

TM 5-5420-279-23

(7) Severe Cissing. Fig 5.7 shows this effect which is caused by painting over grease or oil

contamination. This may affect the base or undercoat or only the finish coat. In any event

the whole of the area affected must be cleaned down to the coating below the cissing. Fig 5.8

shows the same effect caused by applying incompatible types of paint - in this case a red

oxide primer and polyurethane based finish coat. This fault should be cleaned down to the

substrate and the correct paint specification applied.

Fig 5.8 Paint Cissing - Incompatible

Fig 5.7 Paint Cissing - Contaminated

Coatings

Surface

(8) Blistering. Although this fault is obvious in appearance, (i.e., dome shaped projections or

blisters) the cause may not readily be noticed. In any event the blisters will most certainly be

retaining harmful agents, such as water vapor or gases, against the substrate. For this

reason alone blistered paint should be cleaned down to the substrate and the cause

eliminated. Fig 5.9 shows blisters caused by aging of the paint system and corrosion of the

substrate.

Fig 5.9 Paint Blistering

5-8 Change 1