Spray Application

Apply to the dry film building specification of a minimum of 50 µm. Airless spray equipment can achieve very high film builds giving rise to runs and uneven coatings. When using spray equipment on hot or windy days, the paint spray may dry before it has reached the metal, which leaves a sandy appearance and feel. This is not aesthetically acceptable and will not provide the even coating required, even though it may measure 50 µm.

Do not spray before 10.00 am or after 3.00 pm as condensation can be present. Outside this time space steel will also cool rapidly, which will impair curing and can result in incorrect film formation. It can lead to early failure of the coating. These hours could be extended in mid-summer to before 9.00 am or after 4.00 pm.

The gloss and weathering characteristics of oven cured and air dried paints are different, and over time a significant difference in colour may become apparent. Variations in natural light conditions will emphasise these differences producing unacceptable aesthetic variations. For this reason, the whole roof area should be painted and not patch painted and this also is the reason why 'touch-up' paint should not be used.

Spray cans should not be used for repairing scratches on pre-painted cladding. Minor surface scratches are best left because they become less noticeable as the coating weathers. If the scratch cannot be seen from the ground, it should be left alone.


Clause Number: 
Revision Category: 
0 - Clause Removed
Revision Detail: 

This clause has been removed during the overall revison of Maintenance. Brush Application is not discussed in Paint.

Draft Clause: