Exterior doors should always have at least one of the final coats applied as soon as possible after delivery or installation. The back of external frames should be coated before installation. Glazing rebates and backs of beads should be sealed with an appropriate sealant. Ensure surfaces and edges are in good condition before applying finishing coats. If the primer or base coat stain has deteriorated it should be re-coated before further finishing coats are applied. Finishing of external doors and frames should be carried out in dry weather using good exterior quality materials in accordance with the manufacturer’s instructions. On external doors, the finish should be an exterior quality paint or a ‘high build’ stain. (‘Low build’ types of stain should not be used on external doors.)