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Post Posted: Wed Aug 19, 2015 4:53 pm 
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As some of you know I have been injecting the deck of my 170 to repair the soft spots. I figured I start a thread with some pics for others that may have to do this.

After I rebedded the leaking scres in the deck last year the soft spots seems to stabilize. That was last year. This spring when I took off the cover I noticed the soft spots were worse. While they did not get any bigger... they were CONSIDERABLY softer. Almost like there was ZERO core in those areas. Also the gel started to get spider cracks along the edges of the soft spots due to flex.

So one day I broke out the aircraft air drill... I put in a 1/4" bit and I put a drill stop on 3/4" up so I would not drill thru the bottom fiberglass layer. I started drilling and right away I found I was right... there was virtually NO core in the soft spots... nothing.. just an open air space... now around the edges there was some wood. but it was all dry. So sealing the holes and keeping the boat covered helped.

Here's a few pics:

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The holes were drilled in an offset grid pattern with approximately 3-4" spacing. I just eyeballed the spacing. I retrospect I could have used an aircraft rivet spacing fan for perfect spacing, but who cares I plan on rolling on some nonskid anyways.

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Post Posted: Wed Aug 19, 2015 5:05 pm 
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After I drilled the holes things got real busy at work so the boat sat in my shop for two months. I think this was good since it was good and hot so the deck had plenty of time to fully dry out. I stuck an air gun into some of the holes and blew some air in there... air just shout out of the surrounding holes. So I know the epoxy had plenty of open space to flow.

I picked up a roll of 3" wide blue painters tape and covered the deck in the areas I drilled. Then I used the back end of the drill bit to pop holes thru the tape..... more Aquaporn pics:

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Post Posted: Wed Aug 19, 2015 5:15 pm 
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I went to fiberglass coatings in St Pete for my supplies. I picked up one gallon of FGCI laminating epoxy, a half gallon of 2:1 hardener, milled fibers, fumed sililca (cabosil), empty calk tubes, mixing cups etc etc.

I chilled the epoxy in the fridge for a bit to give me some more working time. I mixed up 9 oz of epoxy (6 oz epoxy 3 oz hardener) and then thickened it with the milled fibers and cabosil and poured it into the caulk tube. I used a cordless calk gun to inject the epoxy, which I think really helps. When I saw the epoxy start to ooze up out of a neighboring hole, I would quickly wipe it off and cover the hole with painters tape.

Here is a pic of the first area I did. I looks messy but all of it is on top of the tape,

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Post Posted: Wed Aug 19, 2015 5:18 pm 
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Some video

youtu.be Video from : youtu.be

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Post Posted: Wed Aug 19, 2015 7:13 pm 
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Nice work!

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Post Posted: Wed Aug 19, 2015 10:23 pm 
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Bruce that looks really cool and the cordless calking gun will be added to the arsenal... Your new call sign, Buckshot :1121_wink: :laugh: :laugh:

Yes, I AM a dink!

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Last edited by dburr on Wed Aug 19, 2015 10:26 pm, edited 1 time in total.
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Post Posted: Wed Aug 19, 2015 10:25 pm 
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Great job Buckshot :1121_wink:

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Post Posted: Wed Aug 19, 2015 11:43 pm 
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Did some more work on the deck of the 170 today. Went down to FGCI and picked up another gallon kit of epoxy and other supplies:

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I was lucky enough to have two helpers tonight. With the extra hands we were able to really make some progress. With one person mixing the the epoxy mixture, while the other wiped off and taped over the holes while I injected we really moved along. In fact if we hadn't run out of milled fibers we would have finished the areas I have drilled.

Injecting the core is actually pretty easy but it's tedious work. Extra hands clearly help. It's funny how the epoxy spreads around in the deck. You'd think it would show up in the adjacent holes... which it does do most of the time. other times it oozes out of a hole three holes away. It was also interesting to find the side of the hull was warm where there deck is butted up against it.

More aquaporn pics:

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I wish I had another set of hands to video the injection process.... oh well.

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Post Posted: Thu Aug 20, 2015 6:51 am 
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One helluva nice job B! That thing will be like concrete when cured out.

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Post Posted: Thu Aug 20, 2015 8:24 am 
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So how did it work Bruce? I have one area on my 246 where the coffin box sits that the core is also gone. I am on the fence about cutting it out or trying the injection like you did? I would love to know what the results are.

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Post Posted: Thu Aug 20, 2015 12:08 pm 
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Nice work! Did you treat the remaining core/wood with copper naphthenate to kill the fungicide?

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Post Posted: Sat Feb 20, 2016 8:20 pm 
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I guess I never finished this thread!

The floor came out rock solid. I planned on coating the deck with Duraback non skid. But I figured I would try drilling into the filled holes a tiny bit and capping them with gel coat.
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Post Posted: Mon Jun 27, 2016 12:55 pm 
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how is holding up? I have similar size area of flex and was going to cut it out but this looks like a much easier option for a novice fiberglass guy.

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Post Posted: Mon Jun 27, 2016 4:19 pm 
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Rock soild!

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Post Posted: Mon Jun 27, 2016 9:47 pm 
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Deck injection works well for smaller areas. Dont count on it as a permanent fix. At some point the areas you can't get to soften up /rot out. The moisture/rot just moves away from the injected area.

Nevertheless, if the rest of the deck seems solid, you can get many years of good use from this repair. And yes....I speak from prior experience.

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