Surface Preparation is the process of
removing contaminants. Surface Preparation may range from a wipe down to a total stripping of coating. The surfaces
are usually Concrete, metal or
aluminum and include ship hulls, large storage tanks (internal and external), walk ways or any hard surface. Removable contaminants include
paint, oil, scale, or rust. Contaminates are removed with water blasting before coating or painting a surface or
additional concrete. Surface Preparation requires special preplanning and
evaluation of potential hazards before work can begin. Concrete scabbling with HP water
leaves a more uniform finish for additional concrete to bond to.
There are several types of Surface
Preparation methods that are used to clean a surface before painting or coating. These include Toxic Cleaning
Solvent, Chemical Removers, Mechanical Removers, and High Pressure Water Blasting. The two most common forms used
in Surface Preparation are High Pressure Waterblasting (water only) and Abrasive Blasting, which uses a large amout
of abrasive (primarily sand).
In recent years with Envirogen
leading the way, HP Water Blasting has become the leading method for Surface Preparation. The benefit of HP Water
Blasting is its extremely ingenious way of being an effective and environmentally friendly way to prepare a surface
for coating application with only pressurized water.
Surface Preparation Techniques
There are primarily two types of Surface Preparation
techniques, Abrasive Blasting, and
Abrasive Blasting (grit blasting) involves the use of compressed air and large
amounts of abrasive (sand primarily) to prepare a surface for coating or paint.
High Pressure (HP) Water Blasting
involves the use of HP Water (usually between 8,000 psi and 40000 psi) to prepare a surface for coating or paint.
HP Water Blasting uses an array of motors (usually diesel to handle the flow rate and psi needed for Surface
Preparation), pumps, and accessories to ensure that a surface is ready for paint or coating is as little time as
Benefits of Water Blasting Surface Preparation
- HP Water Blasting is cleaner and less wasteful
than Abrasive Blasting
- Compared to Abrasive Blasting, HP Water Blasting
leaves 98% less residue behind
- Envirogen HP Water Blasting is dust
- Dust free environment allows coating and
painting to happen simultaneously with Surface Preparation
- Dust sensitive areas can be maintained while
Surface Preparation is taking place.
- Removal of multi-layered coating systems is
- Preparation of specific areas is possible
without harming the surrounding areas
- HP Water Blasting is extremely gentle. It will
not distort or change the physical property of the surface
- There is no damage to sensitive areas, such as
welding seams and connecting joints
- Lower cost for disposal of
- Prepared surfaces are contaminant