Alligator crack: paint film on the surface of a similar crocodile phosphorus slice of the rules of the crack phenomenon.

Possible causes:

Reason 1: the flexibility strong coating, such as latex primer coating on the high hardness of coatings (like alkyd enamel).

Reason two: in the primer coating paint when working.

Reason 3: oily coating natural aging due to temperature fluctuations.

Reason 4: in the primer coating paint when working.

Five reasons: oily coating due to temperature fluctuations and natural aging; Continued expansion, leading to loss of coating the elastic.

Solution: the old paint film completely uprooted and polished surface. In construction of large area, can use a heat gun to improve construction, can use hot spray gun to improve the efficiency of construction, but pay attention to avoid light coating or base material. Surface with a high quality latex or oily primer, coating quality of external wall latex paint again.

Blister: local lost due to the paint film adhesion, separated from the substrate surface and bubble phenomenon.

Possible causes:

One, of coating on the surface of hot under direct sunlight.

Second, in the wet surface coating solvent or alcohol acid coating.

Three, the metope of evaporating moisture (relative to the solvent or alkyd paint, latex paint is not easy to happen). Shortly after emulsioni paint is dry, especially the surface pretreatment of inadequate, is exposed in the dew, humidity or rain.

The solution:

Method one: if the bubble continues to base material: trying to get rid of the moisture source. Repair loose caulking glue; Consider installing fan.

Remove air bubbles (see below).

Method 2: if the bubble did not continue to base material: put them away, the subsequent polishing. Any place to appear bare wood primer, and then painting quality exterior wall coating.

Method 3: pulverization: in the process of weathering, the surface of paint film can form a layer of fine powder, it can lead to film fades. Although the paint film of the wear degree of pulverization is normal and reasonable, but for the paint film of the excessive erosion can cause severe pulverization.

Solution: first of all with rigid bristle brush (using a wire brush or masonry surface) the residual powder compound are cleared as far as possible, and then with a rubber hose water or cleaning machine with dynamic rinse thoroughly. After drying, with the hand to check any residual powder on the surface of compound.

If there is visible powder compound exists, coating quality is oily or 100% pure c emulsioni paint primer (or in the brick surface using similar blocking agent), and then painting quality exterior wall coating; If there is only little or no residual powder compound, and the original paint film is in good condition, primer is not required.