I've had this before, it looks like early osmosis but it maybe something else unknown.

It does look like potentially water damage, perhaps osmosis as suggested.  Ensure the boat is fully dried out before repairing.  A relatively simple gelcoat repair then sand and polish to match as described above will be whats needed.

If the damage is under stickers. you will probably need to peel them off and replace with new once the repair has been done.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Hi Tom,

Thanks for your reply. That's good news that we can use standard gelcoat, however, I'm a bit concerned about how thick the gelcoat is as the carbon weave texture is visible, I would imagine to get a 7.5m boat including ama to weight 9.8kg, it will be thin. Also, how easy is it to match the colour?

I have also noticed, since posting, that the colour sections on the top deck seem to be applied vinyl sections as their edges are raised as opposed to being under the gelcoat, I am waiting for a response to the manufacturer as to what these are but if they are applied vinyl sections and the bubbling in this area is in the gelcoat under them, this will complicate things.

We are in Stoke-on-Trent, so within easy traveling distance of Nottingham. When you say you may be able to help, do you mean in assessing it further or do you do repairs?

Looks like there has been some osmosis happening and has caused the surface to blister.  I would sand back the bubbles and let it fully dry out indoors if possible. Then fill with a white gel coat and wax add. 

Hi, my wife has a full carbon Allwave Vanguard Outrigger canoe.

It is only about 12 months old and we have just removed the cover after being stored for the winter to find an extensive 'roughness' on the gel coat - like tiny bubbles, really course to the touch. Also in places, there is visible bubbling, see picture.

She has only over used plain water to clean it (after ever use) and 'Car Plan bumper shine' to polish it, which was recommended by the seller.
It has been stored in a nylon sock and not come into contact with any chemicals. There was no problem when it was last used in October/early November - could frost have damaged it?

Firstly, can you suggest what might have caused the problem, and secondly what products do I need to repair it. I specifically want to know if I need to colour the gel coat (the boat has a multi-colour design!!) or will I be able to just sand away the bubbles and re-coat it with clear gel.


(The darker lines are reflection of trees)