Flocculation
. Flocculation (floating)
Cause
Flocculation (floating) is caused when the pigments have not been dispersed correctly during the manufacturing process. It can also occur if the product is obtained from a supplier who has used a colour tinting machine to provide the shade required. And the mixing/agitation of the paint has not been sufficient to disperse the added colourants.
Remedy
If the paint product was factory made and tinted it would not be possible to have this dispersion rectified, therefore, a new batch would be required. If the product has been mixed by an independent supplier, then it may be possible to have the paint agitated again to disperse the colourants properly. When more than one tin of the same colour is obtained and mixed at source, each tin supplied should be boxed together before use to ensure uniformity of colour.
Flocculation is a manufacturing fault
Masonry Rust Spotting
Masonry Rust Spotting
Cause
This staining is caused by iron oxide being present in the sand content of the stucco finish mix and is activated by moisture coming into contact with oxide particles.
Solution
Ensure the surface is completely dry and apply a suitable sealer to the affected areas which would normally be oil or spirit based. If a standard water based masonry finish is to be applied and a stabilising solution has been used and the finish is glossy glossy finish then this should abraded to provide a suitable key.
Where rust staining is present it is recommended to use an oil based masonry paint based on Pliolite® (Goodyear Tyre & Rubber Co. Inc) resin.