One of the prime hazards to a canvas is water, either as vapor or as humid air. If a canvas is moistened from the back, the picture may detach from the surface. If a canvas is stored in a warm, humid environment, the growth of mold can occur. If the growth becomes too predominant, the mold must be physically removed. The best prevention against mold is to store a canvas in a cool, dry environment.
Insects can also pose a hazard to finished works, especially in semi-tropical areas.
The best prevention for insects is to keep a clean work and storage area that is not too humid. If insect problems persist, call a professional. Physical protection and additional support are important for extending the life of a finished canvas. When properly planned for and executed, a frame can both protect and enhance the final appearance. Frames are most beneficial for works that will be transported extensively.