PDA

View Full Version : whats going on with bottom of boat


el pescador
10-17-2006, 10:03 AM
hello, i have just purchased in the dark a 1969 20ft bertram and after geeting home i discovered the bottom only has 100's of little little half moon circles about like the end of a finger nail shape they are randon along the bottom, i poped one with the edge of knife blade and it poped out a piece of gel coat about dime size ....any clues whats happened here...tried to photo but can get good enuff results to post...thanks
Riverman
10-17-2006, 11:06 AM
That is called osmodic (osmosis) blistering. Try a Google search on the subject, not difficult to fix, just lots of work.
el pescador
10-17-2006, 11:59 AM
all the research and viewing pics of blistered boats these do not look like what i'm seeing do not know enought about the stages of blistering....did show some pics to a fiberglass shop and they could not see from the pics enuff to come to a conclusion but felt from the pattern they were'nt blisters ....no water what so every .....could very well be blisters will again try to post photo later today.....thanks for any help
fiberglass jack
10-17-2006, 10:05 PM
pop one of them and if it smells like vineger its osmosis
el pescador
10-18-2006, 06:41 AM
poped serveral no smell whatsoever...let me add this hull has not seen water in at least 16-18 yrs would this matter, been in storage since 1990 or more....thanks again i'll try to post pic asap.
el pescador
10-18-2006, 11:14 AM
what to do to reduce file size...thanks
vector mike
10-18-2006, 11:51 AM
I'll post it for you.
vector mike
10-20-2006, 11:04 AM
I left it big so you could see it best

http://img166.imageshack.us/img166/8781/beforepopbs2.jpg
vector mike
10-20-2006, 11:07 AM
I left this one big too.

http://img73.imageshack.us/img73/710/afterpopka2.jpg
rchevelle71
10-22-2006, 12:53 AM
My Pantera has the same thing, it is from air bubbles under the glass when they hand laid the hull into the mold.
el pescador
10-22-2006, 08:44 AM
did u repair or what
IMAD!man
11-05-2006, 08:01 PM
Looks like some dry laminate. Sometimes if the skin out layer is not wet out properly and is completely kicked when addition lay up is performed you have very dry areas of laminate directly beneath the gel coat. The structure of the boat is intact but over time you see these types of problems. Also the boat is never going to like being left in the water.


www.bowkersfiberglass.com