Little Pinholes In Fiberglass

[Plymouth Sailor]

I just purchased my first Irwin sailboat (28). I’ve been sanding down the topside paint and have found little pinholes in the fiberglass and/or the gelcoat. My previous boat, a Hunter didn’t have anything like this. Has anyone seen the same on their boat and if so, do you know what it is?

 

[sail sfbay]

I understand pinholes in gelcoat may be caused by air pockets or dirt getting into it during spraying. These threads might shed some light on what causes pinholes: Pinholes in gelcoat (talkcomposites.com) and Pinholes in gelcoat after spray | Boat Design Ne . A 37 year old boat I recently purchased had pinholes in the pattern nonskid. Repair plan is to either fill them with thickened epoxy with cabosil and/or fill with color-matched gelcoat using Flex-Mold. More information on how to repair pinholes may be found in ths thread: filling pinholes in epoxy resin / fiberglass | Boating Forum - iboats Boating Forums