Are we missing the boat as to the real reason for a barrier coat? Most early fiberglass boats did not have a vinylester layup in the outer portion, then switching over to polyester. Water will eventually begin to degrade a polyester resin layup once the gelcoat surface has been removed. The same thing happens with gelcoat blisters.
After going thru the effort and expense to strip a fiberglass hull of its old dinosaur skin why not do a thorough job on the surface . You apply barrier coat usually only once. Yes, applying an epoxy barrier coat system is expensive and timing is everything during the installation until you have applied the first coat of ablative. BUT …. The effort is worth the reward.
- Media blast of chemical strip
- let the hull dry and sand to #80
- apply a tight epoxy skim coat over blisters
- apply a second tight skim if necessary
- apply the barrier system within the time window
- apply any color ablative first coat
- apply the color of your choice as the final coat
- the following season simply abrade and touch up the running surfaces that have exposed the base color ablative.
I too would like to know if it’s ok to barrier coat over my lifting rails. I have a new set in the garage floor that will be installed with Plexus very soon………
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