Sweep Blasting 
 
This process is often used to prepare structures where an existing coating has deteriorated or a recently blasted surface has flash rusted. Intact paintwork needs to be brush blasted to remove loose paint, contamination and produce a surface profile for subsequent recoating. 

Any corroded areas will also need to be blast cleaned to a specified standard. A smaller garnet grain abrasive will effectively etch the intact coating, while scouring into any existing surface profile on the exposed substrate, enabling the original profile to be efficiently re-serviced for the new coating. It also facilitates a feathered transition between intact coating and bare steel.

General Maintenance 
 
Blasting with a finer grade garnet is beneficial when you have low build coatings or heavily pitted surfaces. Using a finer grade garnet on low build coating systems results in a faster blast with more particles impacting the surface per square foot. In the case of heavily pitted surfaces, finer garnet particles are able to fit into pitted areas to clean where coarser particles cannot. 
 
Therefore, using a finer garnet grade can prevent premature coating failure due to substandard cleanliness. Furthermore, as garnet is an abrasive that generates minimal levels of dust, it facilitates efficient surface preparation without undue contamination of surrounding areas. 
 
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