Which test is used to assess the conductivity and presence of soluble salts in surface preparation?

The test that is specifically designed to assess the conductivity and presence of soluble salts in surface preparation is the Soluble Salt Test. This test is crucial in ensuring that surfaces are adequately prepared for painting, as soluble salts can lead to premature paint failure due to issues like corrosion or adhesion loss.

The Soluble Salt Test typically involves using a conductivity meter or test strips to measure the level of salts present on a surface after cleaning. Accurate assessment of soluble salts is vital because they can attract moisture and affect the performance of coatings.

The other tests listed serve different purposes: the Blotter Test is used for evaluating the effectiveness of surface cleaning methods, the Chalking Test assesses paint durability and degradation due to weathering, and the Brestle Test measures the bond strength of coating layers but does not specifically focus on soluble salts. Thus, the Soluble Salt Test is the most relevant for evaluating surface preparation concerning conductivity and soluble salts.