GRP/Fibreglass Questions

 

Q. What is a typical paint system for a GRP/Fibreglass vessel?

A. If painting on to a new substrate or to a clean gelcoat we recommend using Penguard HB as a primer followed by antifouling below the waterline and a topcoat above.

 

Q. How can I prevent osmosis in my GRP vessel?

A. Osmosis is recognised as the main enemy of fibreglass boats. It occurs as a result of water vapour and humidity transmission through the gelcoat layer which in turn affects the fiberglass laminate and its structural resistance. One way of preventing osmosis occurring is to use Penguard HB which is a high build epoxy coating that is much more waterproof than the gelcoat.

Note: Moisture content of the hull has to be less than 1% before application of any coatings.