Power tooling is a method of surface preparation commonly used in tight spaces where access is limited. Pneumatic, electric, and hand tools such as angle grinders, needle guns, wire wheels, wire brushes, scrapers, and sanding pads can be used to remove rust, paint, and other contaminants from a surface.
Power tooling is a slower process than abrasive blasting, and while there are standards to define requirements for surface prep (SP3, SP11, SP15) prior to a coatings application, most agree power tool prep creates an inferior surface for painting. Often, power tooling will be specified in areas where normal blasting can not happen, like in bilges and mechanical rooms of ships.
Power tooling can be time-consuming and physically demanding, and can not provide the uniform and thorough surface preparation that abrasive blasting can achieve. Additionally, power tooling may not remove deep rust or Grade D corrosion, and is not capable of imparting the same depth of surface profile as abrasive blasting.
When tooling to an SP15, power tools such as grinders, sanders, and rotary tools can remove some grades of rust, paint, and other contaminants from a surface. However, power tools can generate heat and cause surface warping, especially in tight spaces where the tool may not be able to dissipate heat effectively. Additionally, power tools can generate dust and debris that can clog equipment and make it difficult to see the work surface, especially in tight spaces. This can result in uneven surface preparation and increase the risk of damaging surrounding areas.
Abrasive blasting is preferred for surface preparation as it can remove rust, paint, and other contaminants from a surface effectively and evenly.
Sponge blasting is a form of low dust abrasive blasting that uses a composite sponge with impregnated grit as the abrasive. Sponge Blasting is often preferred for work inside tight spaces such as tanks as it can provide a controlled, uniform profile with dramatically reduced abrasive rebound and increased visibility for workers.
Sponge Media is capable of creating profiles greater than 10+ mils (250μ) or can simply clean the surface, without creating a profile. Sponge-Jet is often used for surface prep in tight spaces, or cleaning and decontaminating areas containing sensitive equipment. In most cases, areas that would normally require power tooling can be Sponge Blasted faster and safer, all with a higher quality surface prep for coatings.