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Swapping out a fin box. Difficult?
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LUCARO



Joined: 07 Dec 1997
Posts: 423

PostPosted: Mon Jul 16, 2018 10:22 am    Post subject: Swapping out a fin box. Difficult? Reply with quote

After hitting a submerged rock the back part of the fin pushed through the bottom of the box. I think it went in about 1/4 inch. I tried filling it in with solarez but I think it is not water-tight as I found a bunch of water in there after the board had been in the car on a hot day.

Thinking of pouring in more epoxy versus trying to change out the box



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dllee



Joined: 03 Jul 2009
Posts: 3856
Location: East Bay

PostPosted: Mon Jul 16, 2018 11:02 am    Post subject: Reply with quote

Just rout around the box and remove with the fin attached.
Buy new box at fiberglass supply, epoxy and glass in
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nw30



Joined: 21 Dec 2008
Posts: 4847
Location: The eye of the universe, Cen. Cal. coast

PostPosted: Mon Jul 16, 2018 2:03 pm    Post subject: Reply with quote

Epoxy alone won't repair it, the lateral forces on the fin will overpower it.
The box needs to be replaced, using epoxy AND cloth.
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kevinkan



Joined: 07 Jun 2001
Posts: 1425
Location: San Francisco

PostPosted: Mon Jul 16, 2018 2:22 pm    Post subject: Reply with quote

the box needs to be replaced. I have replacement slot boxes. A board builder will build a divinycell cassette for the new box and install the whole thing.
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dllee



Joined: 03 Jul 2009
Posts: 3856
Location: East Bay

PostPosted: Mon Jul 16, 2018 3:03 pm    Post subject: Reply with quote

Nw30, what do you think GLASS is?
And when you rout, you widen the cavity by at least 3/16", which is enough reinforcement AROUND the box.
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U2U2U2



Joined: 06 Jul 2001
Posts: 4687
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Jul 16, 2018 5:52 pm    Post subject: Reply with quote

Is that slot box (photo) a center fin ?
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LUCARO



Joined: 07 Dec 1997
Posts: 423

PostPosted: Tue Jul 17, 2018 12:55 am    Post subject: Reply with quote

nw30 wrote:
Epoxy alone won't repair it, the lateral forces on the fin will overpower it.
The box needs to be replaced, using epoxy AND cloth.

Makes sense thanks
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LUCARO



Joined: 07 Dec 1997
Posts: 423

PostPosted: Tue Jul 17, 2018 12:56 am    Post subject: Reply with quote

dllee wrote:
Nw30, what do you think GLASS is?
And when you rout, you widen the cavity by at least 3/16", which is enough reinforcement AROUND the box.


I think NW30 was referring to my strategy of just pouring epoxy into the existing damaged box.
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LUCARO



Joined: 07 Dec 1997
Posts: 423

PostPosted: Tue Jul 17, 2018 12:57 am    Post subject: Reply with quote

kevinkan wrote:
the box needs to be replaced. I have replacement slot boxes. A board builder will build a divinycell cassette for the new box and install the whole thing.


Do you know if there is a cassette around the current box?
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U2U2U2



Joined: 06 Jul 2001
Posts: 4687
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Tue Jul 17, 2018 8:45 am    Post subject: Reply with quote

The support around the box from the factory, is probably not sides and bottom.The PVC will have a layer of cell ON top diviny , core cell , many others do the same function, to strengthen the support around it. It comes in sheets of various thickness, 1/4 + would do. Epoxy the cell on the 4 sides, use clamps or vise till cured.

Remove the old box, you could cut with a box knife or drill holes and cut between the holes with a saw, the obvious is a router, but not necessary, you could even chisel it out, I would drill a lot of holes.

The cassette gets inserted , wrapped in glass , minimal, carbon layer desired, also. Carbon first.
The harder part is to tie the cassette into the top layer of the board, overlap glass .
Sanding , much. Assure the new box is positioned straight.

You may need to remove more PVC inside the cavity if it DOES have water damage, in this case I remove, and replace with pour foam 8lb, then cut back out to fit the box.

A option would be , remove box, with opening larger than needed by about 3/8, fill entire area with pour foam, remove pour foam enough to insert cassette with carbon/glass . This worked many many times for me.
Pour foam is watertight and very light.

Using these expectsome weight gain, epoxy is heavy.

If this box is a slot box, I would replace with a US BOX, cheaper as strong or more so, offers some fin adjustment, install procedures the same.
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