What is the recommended final thickness of gel coat after curing?

The recommended final thickness of gel coat after curing, which is generally accepted in the industry, is approximately 22 mils. This thickness ensures adequate protection and durability of the gel coat applied to composite surfaces. It strikes a balance between being thick enough to provide a solid barrier against moisture and UV damage while avoiding excess thickness that could lead to issues such as cracking or delamination.

The specified thickness is critical because a gel coat serves not only as a cosmetic finish but also as a protective layer, enhancing the longevity of the underlying materials. Maintaining an appropriate thickness helps ensure that the gel coat fulfills its roles effectively over the life of the composite structure.

Understanding and adhering to these thickness specifications is essential for anyone involved in the application and maintenance of composite materials. Using values outside of the recommended range could compromise the performance and aesthetic qualities of the gel coat, which can lead to repairs or frequent reapplications.