Transcript Photo Album - Islander 36 Association, sailing, racing

by
Eric Mueller
and
Roger Anderson
Starboard Side no moisture on the meter and taps out good
Backing plate removed. The holes here are actually in good
shape. No ovaling and the wood is solid .
Port Side No moisture on the meter and taps out good.
Back side looks good too
Bottom needs a little retabbing but not in too bad shape
Backing plate removed shows ovaled holes and rot
behind the chain plate.
This is a sign of impending failure
Angled section removed you can see what
only a little force did to the rotted area.
The back side and a closer look at the damage
Bulkhead removed. A slot was cut from the
bulkhead to the hole for the sink.
From below
View from the head
The new larger bulkhead next to the original used as a template
The new bulkhead fits well, we intentionally left a
gap to the hull to prevent creating a hard point.
The new bulkhead slid right into the slot
We extended the chainplate and here is the upper
backing plate helping hold the bulkhead in place
We used polyurethane expanding flotation foam to form the filets
The foam was a pain to shape, we did not get it perfect
Upper portion ready to sand and glass
Upper portion is glassed in. We used a Bi-axial glass with a
matt sewn on (knytex)
Not the neatest fillet. Glass was laid in place dry and marked for
cuts along the curve. The glass was then cut before proceeding.
It is hard to see but the black line is where a cut was made and
the fiberglass overlapped.
The neighboring bulkheads below were re-tabbed at the same time
Things are not perfect, but they are functional. The piece for the slot we removed to
get the old bulkhead out and the new one in was replaced and epoxied into place as
was the gap at the shelf to bulkhead joint. The final glassing is going to be the shelf
to the bulkheads. It is more for rigidity than adding strength.
To lay the glass we used a big plastic mortar tub. This allowed the epoxy to spread
out. We mixed multiple smaller batches of slow epoxy and poured them into the
tub. We timed the mixing of the batches at 2 minutes of fast stirring once both
components were put together. It is not recommended to use the same mixing
bucket for multiple batches so we had about a half dozen of the 2 qt plastic paint
buckets. We then laid the glass into the epoxy to just saturate it. We took the
saturated glass, put it in place and used a ridged metal fiberglass roller to ensure the
fiberglass was flat and there was minimal excess resin. We immediately cleaned up
any excess that did occur. You do not want wet epoxy in the bilge!
A couple of notes about safety and clean up. We went through lots of gloves and
chemical resistant suits. It is worth the investment. Don’t forget the hats and glasses.
Everything that was not getting glassed got covered in 6 mil plastic sheeting taped
up with blue masking tape.
Epoxy can be left to harden in the mixing buckets and will peel away from the sides.
We cleaned our plastic stir stick, tools, and tub with alcohol and rags.
To clean ourselves since there does not seem to be any perfect way to keep the epoxy
under control we used vinegar. Yes vinegar. It makes a great cleanup solvent. I
always take a shower with it after epoxy work even if I think I have managed to not
get any on me. I do not know what the chemical reaction with acetic acid and epoxy
is so I did not want to use it on tools or items that were going to be used for epoxy
again, but it sure works great for removal of uncured epoxy on skin.
I will try and get some additional pictures of the epoxy process. It is kind of hard to
handle a camera covered in epoxy.
The wood used was BS1088 marine grade plywood from MacBeaths hardwood in
Berkley. Make sure the plywood is stamped that it meets the BS1088 standard if you
decide to get it from there they also have regular 13 layer marine plywood and the
workers really do not know the difference. The advantage of the BS1088 plywood is
that it has no voids is stronger, stiffer, and lighter than the comparable 13 layer
marine plywoods I have found.
I eventually replaced the starboard bulkhead as the hidden edges turned out to have
some rot. The Starboard bulkhead that the chain plate is attached to is attached to
the liner and not to the hull. The plywood on the hanging locker side is what is
attached to the hull. My solution was two fold. I had already lengthened and offset
the chain plate to attach to the glassed in bulkhead as well. When I replaced the
upper portion that was originally the only attachment for the chain plate I epoxied it
to the liner essentially creating a single bulkhead sandwich. If someone wants I can
post some pictures I have from that operation.