Parallax wrote:

So, here is another idea for blisters: Useless idea #3729

AHAH! CAUGHT you re-using a number! This should be 3730 or so ;-)

Since blisters are caused by poor wetting of the skincoat, why not
make tiny holes in a large blister and inject very thin epoxy into the
blisters (after forcing as much water out as you can) and then apply
pressure to cause it to re-conform to the hull as much as possible
forcing epoxy out the many holes. There are also materials (think
superglue) that polymerise in the presence of water, maybe inject
them.

Might be an idea, but I just found out that improperly wetted out glass
in our new anchor well did NOT wet out when I put additional on top. I
suspect what little resin was there prevented new resin being absorbed.
In my case, it's of no significance since we put a couple of more layers
of properly wetted out glass cloth over for strength and it's not going
to be a normally-wet area, so blisters will not be a factor.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

x-no-archive:yes
Jere Lull wrote:

Parallax wrote:

So, here is another idea for blisters: Useless idea #3729

AHAH! CAUGHT you re-using a number! This should be 3730 or so ;-)

Since blisters are caused by poor wetting of the skincoat, why not

When we hauled our boat for the pre-purchase survey, the surveyor
found blisters, which he showed to me. I saw them. We've never seen
those blisters since on any subsequent haulout. They've disappeared.
This was a (at the time) 19 year old boat.

So I'm not sure all blisters are caused by poor wetting of the
skincoat. Bob thinks that the ones we saw were in the paint.

make tiny holes in a large blister and inject very thin epoxy into the
blisters (after forcing as much water out as you can) and then apply
pressure to cause it to re-conform to the hull as much as possible
forcing epoxy out the many holes. There are also materials (think
superglue) that polymerise in the presence of water, maybe inject
them.

Might be an idea, but I just found out that improperly wetted out glass
in our new anchor well did NOT wet out when I put additional on top. I
suspect what little resin was there prevented new resin being absorbed.
In my case, it's of no significance since we put a couple of more layers
of properly wetted out glass cloth over for strength and it's not going
to be a normally-wet area, so blisters will not be a factor.

grandma Rosalie

S/V RosalieAnn, Leonardtown, MD
CSY 44 WO #156
http://home.mindspring.com/~gmbeasley/id2.html

Rosalie B. wrote:

When we hauled our boat for the pre-purchase survey, the surveyor
found blisters, which he showed to me. I saw them. We've never seen
those blisters since on any subsequent haulout. They've disappeared.
This was a (at the time) 19 year old boat.

So I'm not sure all blisters are caused by poor wetting of the
skincoat. Bob thinks that the ones we saw were in the paint.

My perception is that any "blisters" that don't penetrate through the
basic layup are inconsequential.

On the Tanzer list, we've had a number of complaints of "blisters" at
the waterline, all less than a dime's size; almost all less than a
quarter inch. As I read the descriptions, they were simply gel coat
expanding and contracting differently than the substrate. That sort of
thing is no problem; I know of no cases that got worse than that.

Blisters extend into the hull's structure. The "blisters" that only
affect the surface are of little consequence.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/