1. Scope
1.1This practice determines the ability of a paint to be recoated or touched up in small areas. Variations in color, gloss, and sheen that result in a different appearance from the original paint can be evaluated visually. 1.2This standard practice describes evaluation of touch-up characteristics in a laboratory-scale controlled environment as opposed to a full-scale field environment. 1.3Evaluation of touch-up properties under constant drying conditions is described. Environmental conditions can be adjusted to incorporate high and/or low temperature drying. The changes in application temperature can lead to larger differences in touch-up than applying both coats under the same environmental conditions. 1.4This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.
5.1During construction of a home, paints are subjected to a wide variety of drying conditions, and this may exhibit differences between the original coat and the touched-up area in appearance after its full cure. Therefore, it is essential for the paint to be able to perform under a wide variety of drying conditions. A paint that does this is very advantageous to the contractor. 5.2It is possible for a paint to have excellent color touch-up, but poor sheen touch-up, or vice-versa. The ideal paint will have both excellent color and sheen touch-up under testing conditions. 5.3Color, gloss and base choice can have a major impact on touch-up of the paint.
Keywords
10.1Touch Up; latex paint; color difference; sheen difference
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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