Hello.. new member and need assistance

General boating discussion
tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Hello.. new member and need assistance

#1

Post by tsgarvey »

Hi all... Unfortunately, I am here because I have some kind of corrosion going on with a boat I recently purchased. First.. I need instruction with how to go about uploading pictures from my pc. Thanks
Last edited by tsgarvey on Wed Nov 18, 2020 2:05 pm, edited 1 time in total.

tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Re: Hello.. new member and need assistance

#2

Post by tsgarvey »

Maybe I figured it out... test

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Last edited by tsgarvey on Wed Nov 18, 2020 10:51 am, edited 6 times in total.

tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Re: Hello.. new member and need assistance

#3

Post by tsgarvey »

So that worked but the detail doesn't appear to be nearly as sharp as the original...

I will add to this thread a little later... and hopefully you folks can point me in the right direction to help fix my boat :thumbsup:

tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Re: Hello.. new member and need assistance

#4

Post by tsgarvey »

Alright.. I purchased this 1995 Starcraft from the original owners who told me it was only used a couple weeks each year for family vacations to Vermont and Canada... that it was garage kept and never used in salt.
I used the boat for the first time two weekends ago for about 6 hours on the lake. The day after I noticed a wet spot on the ground the size of a silver dollar under the rear of the boat. Got underneath and saw a small drip with a speck behind it. I poked very lightly at it with a drill bit and the hole grew to what it is in the picture. So.. I started looking all over for any imperfections I could find... and I found 15 more. Like I said... most of them just looked like specks of dirt with a few that looked like small circular dimples inward. No flaking paint or bubbles outward. It seemed as though I was picking paint away with no metal behind it. I'm so glad the holes didn't grow larger while we were on the water!
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So.. I removed some of the back interior and drilled some holes in the floor. I found some wet foam.
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You can see the hole where the hull meets the transom and the one near the trailer roller in pics above which is next to a deck support that runs front to back.
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What I'd like to know is if this is Crevice Corrosion and/or Galvanic Corrosion.. I'm not good with science and when I've looked it up I cannot soak in or get what I am reading. Was this caused by the water trapped in the foam? Not by an electrical issue on the boat.. or not Electrolytic Corrosion.. correct?
Most of the holes that I found are in the back 2 feet of the boat (maybe even less) from one side to the other.. and 2 or 3 that spread out going forward.. maybe halfway down the starboard side. They all seem to be where there is foam under the deck. I intend to remove the entire deck.. unless you guys tell me not to waste my time. Is this salvageable? Thanks in advance for any advice or guidance you can send my way... hopefully in a positive way! If you need any more info or pictures.. let me know. Tom...

kmorin
Donator 08, 09, 10, 11, 12, 13, 14 15, 16 17, 18, 19, 20
Posts: 1560
Joined: Mon Aug 18, 2008 1:37 am
Location: Kenai, Alaska

Re: Hello.. new member and need assistance

#5

Post by kmorin »

tsgarvey,
we have quite a few threads along these lines here- not sure exactly where they are? BUT... the search function will help find them.

We've gone over this more than a few times after hearing from guys like you who have some corrosion in their boats.

Before I try to comment much, I'd encourage you to get the foam out, the bilges cleaned and dried, and see if you can make sense of our many previous discussions here on the Forum. A decision about the boat's future is only possible after the entire bilge is free of foam, and cleaned out, and dried.

Cheers,
Kevin Morin
Kenai, AK
kmorin

tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Re: Hello.. new member and need assistance

#6

Post by tsgarvey »

Alright Kevin.. I did read through some previous threads here. You did just say get the rest of the foam up.. so I'll take that as a somewhat positive sign and move forward. Thanks for your comment...

kmorin
Donator 08, 09, 10, 11, 12, 13, 14 15, 16 17, 18, 19, 20
Posts: 1560
Joined: Mon Aug 18, 2008 1:37 am
Location: Kenai, Alaska

Re: Hello.. new member and need assistance

#7

Post by kmorin »

tsgarvey,
I'll expand on my logic a bit? If you'd known the boat's true interior condition- prior to buying it- would you buy it now? Probably not? Why is that? Well it seems to me that you bought it thinking it was still fully functional as a boat- meaning it would hold the water out!

However, upon learning that it has at least one area of severe internal corrosion; it seems to me you'll need to know the extent of that condition before even trying to plan the boat's future?

If, for example there's only one location of the corrosion, it may be worth the costs/efforts to patch that one area? (not deciding how or if you will here) However, unless you can define the area(s) of the bottom that are sound vs corroded?? then you can't know enough to make a sound decision about moving forward.

Not trying to build up your hopes, or to rain on them... just mentioning that if you knew about the entire boat- you can plan logic steps but if you remain uniformed- you can't plan those steps.

One end of the spectrum is that only one area needs patching- and is cost effective- the end of the potential status is the entire boat is corroded passed cost effective repair? Either way, you'll have to pull the deck boards and get to clean metal to know?

Good luck I hope the problem is confined to one area.

Cheers,
Kevin Morin
Kenai, AK
kmorin

tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Re: Hello.. new member and need assistance

#8

Post by tsgarvey »

I get it Kevin... I'm working on it. Should have the floor out in the next two weeks. Thanks again

Chaps
Donator '09
Posts: 2180
Joined: Sun Jan 13, 2008 12:19 am
Location: Seattle, WA

Re: Hello.. new member and need assistance

#9

Post by Chaps »

Pitting under flotation foam is typically caused by the trapped moisture in contact with the hull becoming anaerobic (lacking oxygen) and providing an environment conducive to a form of bacteria that produces an acid that eats the metal, a process sometimes referred to as biocorrosion. To save your boat, as best you can remove the foam, lightly sandblast the affected areas inside the hull, coat the blasted metal with thinned epoxy barrier coat primer, then fill the pits with epoxy paste, sand the hardened filler to smooth things out a bit and then coat the entire area again with epoxy primer and finish it off with a bilge paint. Get under the boat and sand off any filler that squeezed out of the holes, apply epoxy primer to these sanded underwater areas then finish off with hull paint.
1987 24' LaConner pilothouse workboat, 225 Suzuki
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tsgarvey
Posts: 7
Joined: Wed Nov 18, 2020 8:53 am

Re: Hello.. new member and need assistance

#10

Post by tsgarvey »

Hello Chaps.. thanks for your reply. As far as light sand blasting goes.. I own a pressure washing business and undstand there is a kit for a pressure washer for wet sand blasting. I've never tried it.. so no experience here. Would advise against an attempt to do it this way? Take it to a pro? Thanks, Tom

Chaps
Donator '09
Posts: 2180
Joined: Sun Jan 13, 2008 12:19 am
Location: Seattle, WA

Re: Hello.. new member and need assistance

#11

Post by Chaps »

Wet would work, I've used them. you can also pickup a hand held blaster to shoot dry but you need a good sized compressor to power one of those.
1987 24' LaConner pilothouse workboat, 225 Suzuki
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please view and like: https://www.facebook.com/bottompainting/

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