Start with the problem or surface instead of choosing a product blindly. This is an information and initial-selection tool, not a structural engineering diagnosis.
Consider surface condition, existing coating, desired finish, washability and preparation before choosing an interior system.
Consider weather exposure, substrate condition, cracks, algae/dust and the manufacturer's recommended exterior system.
Identify whether the issue may involve cracks, joints, surface failure or water ingress. Select a waterproofing system only after checking the manufacturer's application requirements.
Wet areas may require a system involving substrate preparation, waterproofing and appropriate finishing layers. Do not substitute products without checking compatibility.
First identify the moisture source and surface condition. A coating alone may not solve an underlying water-source problem.
Choose the finish according to wood condition, desired appearance, durability requirement and the manufacturer's preparation/application system.
Surface preparation, corrosion condition, primer and topcoat compatibility are critical. Follow the exact manufacturer's system.
Investigate peeling, blistering, cracking, chalking, cissing or poor adhesion before recoating. The technical library provides general coating-failure education.