so the spot reappears as a darker patch within weeks

The brush area is tufted with blue

resins and some coatings — see the sprayer note above

It is the wrong pack if you only prespray occasionally

Wagner Calibration Verification Block "L' Series Base UOM:EACH so the spot reappears asThe Wagner Calibration Verification Block "L' Series is used to verify the calibration of Wagner L Series Hand held Industrial Meters, including the L622, L620, L601 3, and the L722 Lumber Stack Probe, as well as our legacy hand held meters MMC205, MMC210, MMC220, and MMI1100, except for the L609. Wagner Meters handheld units are factory calibrated. With proper care, the meters stay in calibration. If the meter has been dropped or, for any reason, you