PRO TIP
Studies show that pre-treatment before coating application is the single most decisive factor impacting lifetime, and thus cost-effectiveness. Poorly pre-treated surfaces with contamination and insufficient blast cleaning result in reduced coating adhesion, blister formation and ultimately corrosion under the coating.
SURFACE PREPERATION METHODS
METHODS
Blast cleaning
Bristle Blaster
Mechanical wire brushing
Mechanical disc-sanding
Needle chipping
Mechanical rust chipping
Mechanical scraping (air powered)
Hand brushing
Hand scraping
Water jetting including ultra high pressure water jetting
Electrolytic descaling
RESULTS
Ideal
Ideal for spot repairs, touch up jobs and weld seams
Risk of polishing
Some risk of polishing
Some risk of indentations
Not good
Good combined with other methods
Poor
Only to be used in combination with other methods
Very good but with risk of flash rusting
Salt water tanks only. For removal of rust scale only not paint