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Old 07 December 2017, 06:05   #1
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Country: Other
Town: Dhaka
Boat name: Bombard Typhoon
Make: Bombard
Length: 3m +
Engine: 8.9hp outboard
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Bombard 420S new transom fitting

Hello all,
This is my first post in the forum, but trust me I have read many hours in this forum to gather knowledge.

First to tell you I am an outdoor person and lives in Bangladesh. Here in the other side of the globe, branded glue like 3M, Bostic, Polymarine, Zodiac are not available.

I have bought this new Bombard 420S (wooden floor SIB) from Canada back in 2011, and in last 7 years has been used only 4-5 times. btw, I do not have a outboard yet . Due to bad storage (not drying properly) now one of the valve came open and also the transom was lose in its boot/brace.

I have brought some industrial 2 part PU adhesive from India and managed to fix the valve. When I removed the transom it was like no glue was used. The lower corner part inside was rotten and soft.

I glued two marine ply using 1 component moisture curing PU adhesive ( Fevicol 1K PUR) to get the proper thickness and copy a new Transom.

Now I need advise:
1. Can i use the 1KPUR to add the wood transom to the rubber like brace/boot? (pic attached).

2. Can I prime the wood with 1K PUR using very thin layer, and then use 2 part PVC glue to attach the PVC floor to the wood part?

3. Though the old transom came out nicely, I cant insert the new Transom in place, any tips without removing the pontoon - Brace/boot glue that seems very much ok to me?


About the glue I have:
* 1K PUR is one component moisture curing PU glue, which expand and form like Foam.

Please help. Thanks in advance.

NB: Yes I have read all the advice in Polymarine website, and got the courage to fix the boat.

http://s21rc.net/upload/sib/rott_transom.JPG

http://s21rc.net/upload/sib/new_transom.JPG

http://s21rc.net/upload/sib/brace.JPG
Fazlay
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Old 08 December 2017, 05:18   #2
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Country: Netherlands
Boat name: Tempo
Make: Scorpion 8.1 Mk1
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PUR is great stuff and it can glue anything together, but it "dies" under uv light. I gather you have enough of that overthere. Furthermore, it doesn't flex but your boat does.

I would order some proper glue and do it the way it should.
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Old 08 December 2017, 12:40   #3
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Country: Other
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Boat name: Bombard Typhoon
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Length: 3m +
Engine: 8.9hp outboard
Join Date: Dec 2017
Posts: 3
Hi Otilly,
Thanks so much for feedback. I will try to bring some proper wood glue for next time.

Now, today couldn't wait and fixed the transom to the rubber boot using the PUR, after few hours it feels super strong, I hope it is waterproof as well.

The bare ply I have primed with a thin cote of PUR, dried few hours. Then used 2 part PVC glue to fix the wood and PVC floor.

BTW, I had to re-open some floor patch to properly get access to the underside of the transom for gluing the floor.

Next week I will put it to water and will update here how it went.

Thanks again.
Fazlay
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Old 09 December 2017, 02:01   #4
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Fevicol 1K PUR appears to be a polyurethane formulation adhesive, which is correct for use with PVC, assuming it is designed for use with plasticizer resistance.

Addition of Desmodur RFE, RE, or Bostik Fixdur 100 reactant / crosslinker is required (triphenylmethane-4,4',4''-triisocyanate) for maximum resistance to heat and hydrolysis (debonding due to moisture exposure).
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Old 09 December 2017, 05:42   #5
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Country: Other
Town: Dhaka
Boat name: Bombard Typhoon
Make: Bombard
Length: 3m +
Engine: 8.9hp outboard
Join Date: Dec 2017
Posts: 3
Hi Office888, so happy to get your reply here. Have searched the whole ribnet site with “transom” and read ALL related to SIB transom fixing, and saw so many post by you.

Today fixed the inside patch of the floor to the new transom with two part PVC glue (glue + 5% hardenar). Wood had a thin layer of PUR. Used Acetone to clean PVC, and MEK wipe to activate.

All looks ok.

PUR used for wood to rubber boot/brace joint.
Here is a pic just took: http://www.s21rc.net/wp-content/uplo...8BEA06773.jpeg
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