All paint shall be thoroughly stirred to give uniform consistency before use. The grade and quantity
of thinners shall be agreed with the paint supplier, excessive thinning will be a cause for rejection of
the work. Paint supplied as more than one component shall be thoroughly mixed in the proportions
laid down by the supplier and applied within the specified time limit after mixing (’pot life’).
Coatings containing heavy or metallic pigments that have a tendency to settle shall be kept in
suspension by a mechanical agitator or stirrer.
No paint shall be used in which the vehicle has set hard and which can not readily be
reincorporated by correct mixing. Similarly, no paint shall be used which has jellified or which has
thickened to such an extent that too much thinner is required to brushing consistency.
No paint shall be used which has livered, gelled, or otherwise deteriorated during storage.
Paint shall not be applied under the following conditions:
- when the temperature of the surfaces is less than 3°C above the dew point of the surrounding
air, and/or the relative humidity is higher than 80% ;
- when the temperature is below 4°C;
- when there is the likelihood of an unfavorable change in weather conditions within two hours
- when there is a deposition of moisture in the form of rain, condensation, frost, etc., on the
- when the surface temperature is more than 35°C.
Each layer of paint shall be allowed to dry for a period of time within the limits prescribed by the
paint manufacturer, before the next layer is applied.
Subsequent layers of a paint system shall have a difference in tint or color.
Particular attention shall be paid to the painting of corners, edges, welds, etc. especially with
respect to the specified minimum dry-film thickness.
During both application and drying, adequate ventilation and lighting shall be provided if the work
area is enclosed.
All steel constructions or plates shall be provided with a priming or coating system to protect the
steel surfaces during the transport, storage, construction and joining stages, e.g. welding of the
All surfaces inaccessible after assembly shall be fully painted before assembly.
* This is likely to occur when the relative humidity is over 80% and the temperature is below
مرجع :IPS-E-TP-100-8.3.2 Paint application requirements