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Old 24-03-2014, 15:49   #1
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Hatch Reinforcement

I have a 1983 Catalina 30. The anchor locker lid is weak and its only a matter of time before someone makes a new hole in my boat. Its just a thin fiberglass layup, no core. I have West Systems 105 Resin and 205 Hardener.
My plan is to pull the lid, sand the inside to remove paint and/or gel coat and prep. Coat the surface with the West mixture, lay in glass mat, and roll out with more resin mix.
Questions: Which glass mat/ weight (seems objective) and how much layup (seems subjective).
Thanks
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Old 24-03-2014, 16:00   #2
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Re: Hatch Reinforcement

Never seen your locker lid, but wouldn't glassing in a stringer be better?
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Old 24-03-2014, 16:03   #3
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Re: Hatch Reinforcement

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Never seen your locker lid, but wouldn't glassing in a stringer be better?
Probably, and less work. I'll snap a pic in an hour, depending traffic.
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Old 24-03-2014, 16:08   #4
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Re: Hatch Reinforcement

Core it or glass in a couple of stringers. Mat will flex and offers little more support.
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Old 24-03-2014, 16:31   #5
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Re: Hatch Reinforcement

Six ounce cloth or mat should be fine. You could turn the layup into stringers simply by glassing over a couple of small tubes or half-round wood mouldings laid across the span when you do it. Coring might be too much effort for the end result to be worth it.
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Old 24-03-2014, 16:35   #6
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Re: Hatch Reinforcement

You're far better off to glass in a couple pieces of ply core or glass/epoxy some foam or balsa core. Far stiffer. Takes a lot of added glass to stiffen things up without it.
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Old 24-03-2014, 17:06   #7
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Re: Hatch Reinforcement

Click image for larger version

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Here is the hatch lid. The FG thins at the perimeter. Center is not compromised.
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Old 24-03-2014, 17:07   #8
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Re: Hatch Reinforcement

That hatch is cored already. It's fine... you really think someone is going to step thru it?
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Old 24-03-2014, 17:09   #9
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Re: Hatch Reinforcement

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That hatch is cored already. It's fine... you really think someone is going to step thru it?

It is cored and appears broken at the edge of the coring
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Old 24-03-2014, 17:09   #10
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Re: Hatch Reinforcement

Yup. I just noticed too. But 3" around the perimeter is not. Just layup. You can see the hairline of the damage, right at the end of the core.
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Old 24-03-2014, 17:12   #11
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Re: Hatch Reinforcement

Same thing on the lazarette, core ends to accommodate weather strip. Click image for larger version

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Old 24-03-2014, 17:19   #12
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Re: Hatch Reinforcement

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It is cored and appears broken at the edge of the coring
Ahh... I see that now... looks like leave the core and grind the damaged area and reinforce that with glass.?
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Old 24-03-2014, 17:23   #13
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Re: Hatch Reinforcement

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Ahh... I see that now... looks like leave the core and grind the damaged area and reinforce that with glass.?

that is what I would try first
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Old 24-03-2014, 17:25   #14
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Hatch Reinforcement

Copy, fellas. Thanks for sticking with me while I get my story straight. Thoughts on which glass and weight? Number of layups?
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Old 25-03-2014, 06:49   #15
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Re: Hatch Reinforcement

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...wouldn't glassing in a stringer be better?
Agreed. If you really need to reinforce it then you need to REALLY reinforce it!
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