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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />breakdown should be less than 20% of the total area of the structure. Beyond this level, <br />the cost benefit of utilizing spot repairs is lessened. <br /> <br />When conducting spot repairs, the application of a full overcoat is preferred for <br />the aesthetic improvement, and because of the additional barrier protection it provides. <br />To be a candidate for overcoating, the existing film must be adequately adhered, with no <br />excessive film thickness or a large number of coats. A blast cleaned substrate beneath the <br />existing paint is also desirable. Marginally adherent films, excessive thickness, underfilm <br />corrosion, or mill scale can be detrimental to overcoating. The additional weight of the <br />overcoat material and curing stresses can cause complete disbonding of the existing coats <br />if they are of insufficient integrity. <br /> <br />Further consideration must also be given to previous or future overcoating. A <br />coating system has a finite level of overcoating tolerance. Eventually, the additional <br />weight and curing stresses will become greater than the adhesive bond strength between <br />the existing coating and the substrate. <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />33 <br />