Deterioration of Physical Aspects
Under good storage conditions what may deteriorate is the physical aspects of the powder coating in its dry powder form, i.e. it may agglomerate, causing the spraying of the coating to be problematic – surging in guns for instance.
Therefore, rather like an old tin of paint where it would be expected that it would require a good stir before using, the powder coating in its original plastic liner should be carefully taken out of the box and rolled gently around before being put back in the box and being ready for use; additionally, should the powder have picked up moisture, leaving the box opened to the atmosphere for a period of time will allow the humidity to equalise. Alternatively, sieving the powder and/or fluidising the powder in a fluidised bed with clean, dry air will break up any small agglomerates.