Overview

The terms "overcoatability" and "recoatability" are used differently. Hence, there are numerous different test methods. Aiming for a standardization and facilitation of communication between contractor and customer, in this International Standard a test scheme has been prepared which determines the procedure for testing the overcoatability and/or recoatability of coatings. We speak of "Overcoatability" in case of the multi-coat system in manufacture, such as applying a top coat to the priming coat. We speak of "Recoatability" in case of repairing or recoating of already completed constructions, such as during or immediately after installation. It was impossible to specify a suitable test scheme for all indicated cases and to combine them in an International Standard. The limitation to "unaged" coatings should be understood as coatings not yet exposed to corrosion stress or similar stress which might influence the recoatability performance. In the case of arising difficulties concerning the interpretation of the term, for example in regard to priming coats as protection for intermediate storage or transport when it takes some time before another coating material is applied, the contracting parties should especially agree upon the approach. Note that the recoatability performance for certain coating materials might be time-dependent. Furthermore, it is recommended that an intermediate drying/hardening should be adapted to in-practice conditions, if it is specified or agreed before recoating. This International Standard leaves various aspects subject to agreement to a much larger extent than common in other standards. However, achieving a wide-ranging applicability of the test scheme only allowed such an approach. The body responsible for this standard is NA 002-00-07 AA "Allgemeine Prüfverfahren for Beschichtungsstoffe und Beschichtungen" ("General test methods for coating materials and coatings") at DIN.

Document: references other documents

Responsible national committee

NA 002-00-07 AA - General test methods for coating materials and coatings  

Responsible european committee

CEN/TC 139 - Paints and varnishes