Remediation of Off-Ratio Coating Technical Bulletin

MANUFACTURER Raven Lining Systems 13105 E. 61st Street, Suite A Broken Arrow, OK 74012 (918) 615-0020 DESCRIPTION In the event of an application of off-ratio epoxy to a surface; removal of the affected material is required in order to clean and prepare the exposed surfaces to receive a top coat. Remediation methods may vary due to the degree of cure of the off-ratio material. Cleaning and surface preparation for additional applications will also vary depending upon conditions present. The following recommended procedures assume a successful application of the base coat that was followed by an off-ratio application of topcoat. This procedure is a recommendation for remediation and reapplication and may need to be modified due to existing or changing project conditions.

REMOVAL OF OFF-RATIO MATERIAL The off-ratio material should be removed by the most efficient method which effectively removes the material without damaging the base coat and/or substrate. Typically this may be accomplished using hand or power scrapers or putty knifes. Once the majority of the off-ratio material has been removed the base coat or substrate should be cleaned of remaining suspect material via solvent cleaning; using clean rags and a clean solvent such as acetone. Depending upon the degree of cure of the off-ratio material more aggressive methods may be required (i.e. dry or wet abrasive blast).

SURFACE PREPARATION OF BASECOAT Following removal of the off ratio material the exposed base coat, and/or exposed substrate, must be prepared to accept a topcoat. Primarily, the base coat must be cleaned of all off-ratio materials, abraded to create a profile and re-cleaned of all dust, dirt, debris, etc. Acceptable profiling methods include dry or wet abrasive blast, power tool, hand tool or a combination thereof. For abrasive blasting, medium grit media should be used to sweep blast the surface in order to create a consistent profile over the coating surface. For power or hand tool preparation, an abrasive paper or disc of 60-80 grit should be used to open and roughen the surface of the basecoat. Following profiling, all surfaces will require cleaning to remove spent abrasive, dust, dirt, and other debris and surface contaminates. This can be accomplished using pressure washer cleaning, blow down with oil free compressed air, or sweeping followed by a solvent wipe using clean rags and clean solvent, such as acetone. The ultimate goal is the removal of all off-ratio material, clean the base coat, profile the base coat and re-clean all surfaces in preparation for the application of the topcoat.

APPLICATION OF TOPCOAT The application of the topcoat can be accomplished via spray or hand application depending upon the project conditions. If the material is to be hand measured, mixed and applied it is of utmost importance to properly measure the material, combine the measured components into a mixing container, thoroughly mix the material using an appropriate power tool (1/2” drill with coating mixing blade), transfer the mixed material to a clean container, and apply to the prepared surfaces using a brush, roller, squeegee, screed rake or other appropriate application device. Caution should be observed when mixing quantities larger than 1/2 gallon as the pot life of the mixed material is reduced exponentially by the temperature and volume of the mix.

For specific modifications to the above procedure please contact Raven Lining Systems to confirm applicability and suitability.

www.ravenlining.com 800-324-2810 ● Email: [email protected] July 2014