CHECKING PROBABLE CAUSES . . . poor surface prep. Applying paint too thin. Loss of elasticity, not expanding or contracting with humidity and temperature. As wood swells, stress breaks the bond between layers and checks form. Checking on unprotected wood is due to delamination.
CHECKING SOLUTIONS . . . remove all loose paint with a scraper, wire brush or power washing for large areas. Feather sand edges. Level uneven areas with exterior spackle, sand and rinse with a garden hose to remove all dust particles.
PRIMERS & EXTERIOR FINISHES. . . Priming is essential for better adhesion, sheen uniformity, mildew control and durability. Use Hirshfieldís 6050 Exterior Oil Primer or 4250 Housecoat Acrylic Primer. Finish with a top quality 100% acrylic exterior latex paint in the color and sheen of your choice like Hirshfieldís Housecoat series.