89 overnighter - slight listing to starboard

PointedRose

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Do you have two batteries on the same side? I do on my overnighter but have a kicker motor on the other side basically offsetting the weight. Anything noticeable while up on plane?
 

jackie52

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Sorry for the delay.
I have batteries on opposite sides- port and starboard. Nothing has been altered or shifted.
I did have a conversation with a seasoned backyard mechanic and he said he thought that any boat over the years can develop cracks and separation at the stern. I have noticed the top aluminum bracing on my boat has separated slightly, enough to show a change in the piece of aluminum and a slight swelling of the stern - indicating water absorbtion. OMG
 

PointedRose

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Have you put it in for the season yet? If it’s still on the hard you can probably do some diagnostics.
Couple things - if there isn’t a spot of leakage below the waterline, it could be there’s a little intrusion from the top. Over time could cause water seeping in. I think the real damage could occur if there is water intrusion and then a cold freeze - expanding water over the winter that would perpetuate the issue. If you take a heavier screwdriver you can tap around the transom to listen for any dull thuds. You could also drill some exploratory holes to see what the core looks like in a couple areas. Wouldn’t be too difficult to refill with epoxy if you didn’t have a bigger issue and would give you peace of mind. Once you start the job seems like there’s only one way to do it- tear it down and rebuild it back up with solid core material. Or sell the boat and try to upgrade with something else if it seems too big an issue. You’d probably get out of it pretty quickly at a solid price.
 

Summertop511

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My 87 did the same. Attributed it to all the rigging to the steering wheel.
 

jackie52

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I used Dumonds Marine PeelAway as a test kit and applied with a putty knife to the starboard chine up to the waterline to remove antifouling paint from years of applications- 6 x 24 inches. After 6 hours I removed the paper/chem solvent and was amazed at its efficiency. However, after rinsing off the residue I started to notice some serious looking blisters(Osmosis)? Small and many! Now I believe I have confirmed my suspicion. I re-cleaned the area and doing so reduced the blisters. Being exposed to the sun and the chemical reaction from PeelAway just torched that area. I covered the area to shade it and the blisters were reduced to near nothing. Go figure?
A friend thought the blisters were so pronounced because it was the first time in years that the hull was able to breath without paint. Thank you Pointed Rose and Summertop!
My next step is to remove all bottom paint with PeelAway. With luck I might find it is not as bad as it appears!! if you have any other advice I'd appreciate it. I've had this boat and engine since '91 and I hate to give up on her.
 

PointedRose

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I used Dumonds Marine PeelAway as a test kit and applied with a putty knife to the starboard chine up to the waterline to remove antifouling paint from years of applications- 6 x 24 inches. After 6 hours I removed the paper/chem solvent and was amazed at its efficiency. However, after rinsing off the residue I started to notice some serious looking blisters(Osmosis)? Small and many! Now I believe I have confirmed my suspicion. I re-cleaned the area and doing so reduced the blisters. Being exposed to the sun and the chemical reaction from PeelAway just torched that area. I covered the area to shade it and the blisters were reduced to near nothing. Go figure?
A friend thought the blisters were so pronounced because it was the first time in years that the hull was able to breath without paint. Thank you Pointed Rose and Summertop!
My next step is to remove all bottom paint with PeelAway. With luck I might find it is not as bad as it appears!! if you have any other advice I'd appreciate it. I've had this boat and engine since '91 and I hate to give up on her.
Take some pictures when you’re down there next.
I’d not give up on it.
There’s a section here on blisters.

 

seasick

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I doubt that blisters are the cause of the list. The fact that cleaning/removing the paint made the blisters disappear tell me that the 'blisters' were only in the gel coat or weren't osmosis blisters at all.

Blisters don't mean that the hull is soaked either and you would need to have a lot of them filled with water to ad up to a lot of weight.
After you strip and re paint the hull, see if the list is the same. You may just have a lot of weigh in the old layers of bottom paint, especially if the paint is/was hard coat and hasn't been removed for a long time. If you strip the hull and sand and suspect your hull is prone to blisters, you would benefit from aan epoxy barrier coat before bottom paint. If you do so, follow the instructions closely!
That said, you might benefit from a moisture reading test to see if the hull is wet anywhere. Remember that the moisture meters generally do not read through bottom paint and will read perfectly OK on a hollow core. My point is that the person measuring the levels has to know what he or she is doing:)
If you are stripping and plan on a moisture test, you can sand/strip a few smallish sections of the painted area to allow the moisture meter to work below the water line.