Good Sam Club Open Roads Forum: Fiber glassing question
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kartsahd

Altus, Oklahoma

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Posted: 02/05/21 05:30pm Link  |  Quote  |  Print  |  Notify Moderator

I have a Carolina Skiff boat that I want to attach a grab bar to the floor. It is about 36' high by 12". I do not want to drill holes into the deck to keep away from water intrusion and I do not think the floor is thick enough to hold. The grab bar has an aluminum base of about 3" by 14". I plan on getting a piece of oak or poplar about that size, putting some bolts through it, making a putty of cab o sil and maybe some mat and gluing the board down with that. Then fiber glassing a few sheets of glass over that. Then I have a nice solid base to bolt to. What I need to know is this a good plan? I looked into just using JB weld or 3m5200 but I do not think it can take the strain. Any ideas? Thanks

JoeH

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Posted: 02/06/21 06:00am Link  |  Quote  |  Print  |  Notify Moderator

You can certainly glass the board down.... but you might want to try 5200 first. That stuff is really strong .


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Bumpyroad

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Posted: 02/06/21 06:38am Link  |  Quote  |  Print  |  Notify Moderator

JoeH wrote:

You can certainly glass the board down.... but you might want to try 5200 first. That stuff is really strong .


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prichardson

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Posted: 02/06/21 07:56am Link  |  Quote  |  Print  |  Notify Moderator

For a grab bar, your plan is next best compared to thru bolting. I would not trust any adhesive in that application. Make sure the deck is squeaky clean before doing the glass work.

Gjac

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Posted: 02/06/21 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

The simplest way if you are going to use FG it to abrade the area where the grab bar will attach, solvent wipe with acetone, and lay 3 to 4 layers of woven glass over the flange of grab bar over lapping 3-4 ins on the deck itself. An 8 harness satin weave is easier to form around the bar than a square weave. I would use an good epoxy resin with the FG cloth maintaining a 60-40% cloth to resin ratio. If you go with a wood board and an adhesive like 5200 the adhesive wont fail but the wood bond line may if you bang it or put enough load on it. If you bond the board flat to the floor the wood fibers are very weak in that direction. Think how easy it is to split wood in that direction. Cab o sil is good for thickening the resin and works well for making a filet but adds nothing for strength. I would not be afraid of through bolts leaking if sealed with the 5200 or 4200 and would be the strongest solution. I am guessing your hull is at least 1/4 in thick.

* This post was edited 02/06/21 12:20pm by Gjac *

QCMan

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Posted: 02/06/21 01:49pm Link  |  Quote  |  Print  |  Notify Moderator

Have you thought of glassing a board to the floor and attaching to that? Seems like the way a boat builder would do it.


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theoldwizard1

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Posted: 02/06/21 03:16pm Link  |  Quote  |  Print  |  Notify Moderator

If that is for a person to grab on to, the amount of force that is applied at 36" is greatly magnified at the base. How is the base constructed. If it does not have multiple gussets it will fail.

The strongest wood for the job is white oak. Much better than red oak or poplar.

Thickened epoxy works well for attaching the wood to the floor, but start by applying un-thickened epoxy to the bottom of your board. Wait until it starts to cure before attaching to the floor.

theoldwizard1

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Posted: 02/06/21 03:18pm Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

I would not be afraid of through bolts leaking if sealed with the 5200 or 4200 and would be the strongest solution.

Both will leak over time. They really are not meant for below the surface bonding.

valhalla360

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Posted: 02/06/21 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Gjac wrote:

I would not be afraid of through bolts leaking if sealed with the 5200 or 4200 and would be the strongest solution.

Both will leak over time. They really are not meant for below the surface bonding.


Actually they both are rated for below the water line and frequently used for that purpose.

That said, a good epoxy fiberglass job will look better and be stronger. I would steer away from methods that incorporate wood.


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kartsahd

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Posted: 02/06/21 05:48pm Link  |  Quote  |  Print  |  Notify Moderator

Tis is what I plan to do. [image]

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