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Coating Performance Over Partially Blasted Surfaces

Coating Performance Over Partially Blasted Surfaces
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Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain. 

Product Number: 51219-180-SG
Author: Patrick Cassidy, Peter Ault, Cameron Miller , Colton Spicer
Publication Date: 2019
Industries: Military , Coatings
$0.00
$20.00
$20.00

Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain. The Navy began investigating this process in the early 2000’s for use on surfaces coated with ultra-high solids (UHS) coatings, which are known to be very difficult and time consuming to remove. As these “partial blasting” or localized preparation initiatives have been shown to reduce rework burden and increase productivity, there is a need to quantify and clarify a few outstanding issues: (a) anticipated service life of a new coating applied over retained, aged coating; (b) specific characteristics of the retained coating which do and do not pose performance risks (e.g., fracturing, profile characteristics, soluble materials, etc.); (c) amenable coatings/ship locations where the use of partial blasting will be of the most cost avoidance. Interim results show that a “partial blast” surface preparation is an effective process to maintain an aged coating in reasonably good condition as long as the procedures and lessons learned outlined within the program are followed. This will involve the proper training of both abrasive blasters and coating inspectors. Coating systems installed over partial blasting have been shown to perform well in the short term (i.e., catastrophic failures have not been observed), and testing is ongoing. Full integration and implementation can be achieved by working with industry and the Navy community to define the process and proper training.

Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain. The Navy began investigating this process in the early 2000’s for use on surfaces coated with ultra-high solids (UHS) coatings, which are known to be very difficult and time consuming to remove. As these “partial blasting” or localized preparation initiatives have been shown to reduce rework burden and increase productivity, there is a need to quantify and clarify a few outstanding issues: (a) anticipated service life of a new coating applied over retained, aged coating; (b) specific characteristics of the retained coating which do and do not pose performance risks (e.g., fracturing, profile characteristics, soluble materials, etc.); (c) amenable coatings/ship locations where the use of partial blasting will be of the most cost avoidance. Interim results show that a “partial blast” surface preparation is an effective process to maintain an aged coating in reasonably good condition as long as the procedures and lessons learned outlined within the program are followed. This will involve the proper training of both abrasive blasters and coating inspectors. Coating systems installed over partial blasting have been shown to perform well in the short term (i.e., catastrophic failures have not been observed), and testing is ongoing. Full integration and implementation can be achieved by working with industry and the Navy community to define the process and proper training.

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Effect of Feathering on Coating Performance

Product Number: 51219-181-SG
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Publication Date: 2019
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Feathering is the process of tapering or blending-in an existing intact coating in preparation of applying a new repair coating. This industry common practice is intended to ensure good adhesion of the repair coating to the legacy coating, and to provide a seamless aesthetic transition for areas where maintenance painting is performed. There are no industry standard requirements for performing feathering, resulting in most specifications having their own unique definition. 
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