However, just remember that both types of material are very UV sensitive. A key component of a materials weight is the type of finish. Choices include coating, impregnation or laminated. The finish is subsequently a vital component of porosity. This provides the best balance between weight, flexibility and aging.
Impregnation is a special type of coating process.
Dipping the material in a bath results in coating both sides of the material. Mylar materials are laminated and provide resistance to stretching, absolutely zero porosity and good resistance to aging. However, mylar popularity has declined because of the extra weight and lack of flexibility. Not all coatings are the same. After weaving the material, Porcher Marine dyes and then coats the material.