My fibreglass is bubbling

[AussieOi]

Has anyone ever experienced convex bumps / bubbles in their fibreglass spa shell.
this has happened to us, have 20-30 small (m&m) size bubble bumps scattered in different areas of our spa fibreglass shell.
have had the spa for over 2 years before this occurred, and seemed to happen after having the spa up at a higher heat - 43 degrees.
our pool installer reckon they have never seen this before, suspect it may be imperfections in the fibreglass shell (below the surface....) anyway have been waiting for 8 months for them to decide what process they are going to take to fix this, under warranty, still waiting for a written report and defined fix -been very patient but starting to get annoyed at their lack of action!
anyone seen or heard of this before....

 

[keithw]

I have seen it on boats. It is usually delamination. Typically it points to an issue during the fiberglass manufacturing process. Usually you have to ground out the bubbles and reglass/gelcoat the area. Some pics might be helpful.

 

[Perpetual summer]

We had a spa that cracked in a half dozen different areas on the top edge a few blisters also.... warranty was as long as it didn’t leak it wasn’t covered. Good luck

 

[AussieOi]

I have seen it on boats. It is usually delamination. Typically it points to an issue during the fiberglass manufacturing process. Usually you have to ground out the bubbles and reglass/gelcoat the area. Some pics might be helpful.

Thats a better terminology - like a blister - pool guys have mentioned yes likely a flaw during manufacture, the bubbles would be grounded out and re gel coated etc