Sand, grit and glassbead blasting are well known techniques in the restoration industry for removing grease and grime build-up, underbody sealant and paint from parts and panels. An unfortunate side effect of these methods is damage to the surface structure, resulting in buckles and bulges. A gentle but equally effective alternative would be welcome.

One answer may be a new technology called dry ice blasting. During the blasting dry ice pellets hit the affected surface at very high speeds. On contact, the solid pellets return to gaseous carbon dioxide in a minor explosion. Due to the sudden increase in volume, the paint or grime layer is lifted and becomes suddenly cooled, becomes brittle and is easily removed. Afterwards, the part retains its original structure.

Thermo Blast, a Queensland based company, are specialists in this blasting alternative. Thermo Blast offers their blasting services for individual restorers and will also deliver the BUSE blasting equipment to the automobile industry. The German engineered and manufactures system combines the dry ice pellets, widely available from the major gas suppliers, with air inside the blasting unit. By adjusting air pressure and concentration of the pellets, you can remove, for example, underbody sealant without damaging the underlying paint layer. As the age and composition of sealants vary, the blasting unit can be accurately adjusted.

Compared to manual removal, dry ice blasting can considerably reduce the time required. A further benefit is that no parts need to be removed. Its non-abrasive nature does not damage parts such as axles, steering elements, springs, shock absorbers or brake lines. Even rubber, other sealing material and glass remain undamaged. This makes the process suitable for sensitive body parts like door panels and bonnets without the danger of pitting or warping. Chrome, aluminium and fibreglass are all safe. Dry ice blasting is also an effective method on engine parts, from pistons to cylinder heads. Unlike grit or glassbead blasting, there is no residue that could later result in an oil duct blockage.