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There are many factors which need to be considered when making the decision to over coat an existing coating system. With the magnitude of data that need to be evaluated in relation to the existing coating system and potential scenarios that are possible it is important to take multiple details into account. Details including inspection criteria of the existing coating system and substrate, owner’s goals and objectives, asset location and environmental conditions must all be taken into consideration.
High performance concrete coatings are frequently applied with a grade of texture to improve traction and safety. The finished texture is dependent upon the size and type of aggregate, application method and density, and the amount of topcoat applied over the texture. Defining the degree of texture within a specification and translating the description to installation has typically been left to individual interpretations.
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Coating thickness is one of the most important parameters influencing durability of a protective coating system. As a general rule-of-thumb, the thicker the coating, the greater the protection. But is there any upper limit to this general rule? This paper looks at durability figures of common protective coating systems for atmospheric and immersion exposure as a function of dry film thickness.
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.