Glassfibre blisters, "boat pox"

Following pictures shows what I found under the old anti fouling paint. I believe these are some minor glassfibre blisters that have been dried out. I'm about to treat them like it is recommended. Open all loose gelcoat surface, wash all opened spots with fresh water, let it dry and finally fill them with epoxy filler. These are very shallow and they are not extending to fibreglass almost at all. These are definitely not bad ones. Only bad thing here is that there is lots of them. They will need some work hours to get them done.

 This is how the surface looks like right after anti fouling paint has been removed.

 Here I have been digging loose gelcoat away. Not that much comes of and they are not that deep.

 I opened those spots little more with an angle grinder. There will be lots of filling to do. Fortunately they are easy and quick to fill.

 Close up of the grinded spot. Solid fibreglass was found right under the gelcoat. According to that these are only minor defects which is good.

Here is link to one good youtube video about fibreglass blistering. This guy explains it pretty well. Those in the video are much more severe than those found on my boat.

I'm On A Boat- Fixing Fiberglass Blisters