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Author Topic: Adhesive for bonding wood to GRP hull.  (Read 568 times)

RWH

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Adhesive for bonding wood to GRP hull.
« on: July 17, 2017, 07:15:59 PM »

I have read that it is best not to use epoxy for bonding wood to GRP hulls because it may distort the hull from the heat generated by the glue. If this is the case, then what adhesive do I use to bond wood to the side of my GRP hull?


Kind regards,
Bob

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Colin Bishop

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Re: Adhesive for bonding wood to GRP hull.
« Reply #1 on: July 17, 2017, 07:22:14 PM »

Epoxy glue will not generate any significant heat in this situation, you have been misinformed. It is probably the best option for bonding the two materials but ensure that the GRP is roughened as the joint will be mechanical rather than chemical.

Colin
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RWH

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Re: Adhesive for bonding wood to GRP hull.
« Reply #2 on: July 17, 2017, 08:00:00 PM »

Interesting as I have been stressing over this and I have seen more than one warning from reliable sources and one source was from a GRP builder of many types of model hulls. But I am glad to know this now I can continue with my build.


Kind regards,


Bob
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Colin Bishop

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Re: Adhesive for bonding wood to GRP hull.
« Reply #3 on: July 17, 2017, 08:09:07 PM »

Used in large quantities the chemical reaction in epoxy can generate some heat but in the small amounts needed to construct models surface to surface you should have no problems.

Colin
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RWH

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Re: Adhesive for bonding wood to GRP hull.
« Reply #4 on: July 17, 2017, 08:18:29 PM »

My hull is 45" long and I wanted to lay a 1/16" x 3" x 24" balsa strip on both sides and then glue my mahogany strips to the balsa. Would that size balsa strips generate too much heat?


Kind regards,


Bob
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bluebird

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Re: Adhesive for bonding wood to GRP hull.
« Reply #5 on: July 17, 2017, 08:33:46 PM »

good evening one and all :-)

just in my humble opinion - the only time heat is generated in Epoxy resin or Polyester resin is

a) When one has the mix ratio wrong i.e. too much hardener to the resin - this generally generates a certain amount of heat. This, if in a combined space such as a mixing tumbler where one has a large concentration of the mixture - this may, if its polyester resin, bubble & smoke ^ dissolve and melt the plastic container that it is held in.   Also noxious fumes will emanate into the air. 

b) Epoxy resin, depending on the type (as there are as we know several types of Epoxy for various applications) tends to do the same as above but can become slightly more toxic if it reaches this stage SO DO BE WARNED

If your mixture is correct though, and you have mixed it in small quantities and spread it over the area thinly - one should have no problem with heat generation.

The things to be cautious about are - the materials which are being bonded together - glass fibre and wood - one will generally have no problems bonding with the polyester/epoxy based resins.   Time to worry is when you have certain plastic hulls and oily timbers such as teak/Iroko which we have to use special glues/treatments for bonding. 

John

ps remember heat + smoke make man take action and run fast :-)
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rnli12

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Re: Adhesive for bonding wood to GRP hull.
« Reply #6 on: July 18, 2017, 07:09:41 AM »

Hi,

I have used Stablit Express for years never had a problem, I think it is branded under UHU now.

Regards,

Rich
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Regards,

Rich

Stan

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Re: Adhesive for bonding wood to GRP hull.
« Reply #7 on: July 18, 2017, 07:39:15 AM »

I stopped using epoxy a while ago.The construction industry now have a large range of adhesives which I have found fits most of our requirements. I recently bought a model and found the timber frame inside tbe hull had been glued using epoxy. The glue had gone very brittle hence the frame and plastic deck just came out of the hull. My thoughts on this matter only no wish to influence your choice of glue you use.


Stan.


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Seaspray

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Re: Adhesive for bonding wood to GRP hull.
« Reply #8 on: July 18, 2017, 09:39:00 AM »

Stan
Can you name a few of the adhesives you use and have you ever used "no nails"
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Stan

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Re: Adhesive for bonding wood to GRP hull.
« Reply #9 on: July 18, 2017, 10:00:49 AM »

HI Seaspray will post some info this evening.

Stan.
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Seaspray

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Re: Adhesive for bonding wood to GRP hull.
« Reply #10 on: July 18, 2017, 10:08:17 AM »

Stan cheers
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Tug Fanatic

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Re: Adhesive for bonding wood to GRP hull.
« Reply #11 on: July 18, 2017, 12:01:47 PM »


HI Seaspray will post some info this evening.

Stan.


Yes we are all looking forward to that!  O0   :-))


On a serious note I have not tried it because of the nastiness of failure but how good are the "no nails"  type products for modelling?
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RWH

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Re: Adhesive for bonding wood to GRP hull.
« Reply #12 on: July 18, 2017, 12:42:02 PM »

Hi Everyone,


Thank you for your replies and I am looking forward to your recommendation on the different brands of glass resins Stan. Has anyone here used
Milliput not for the timber siding but for the floor ribs? It would not work for the siding but should do well for the ribs. It takes about 24 hours to cure and it give off no heat and a very strong bond from what information I have received.


Kind regards,


Bob
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Stan

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Re: Adhesive for bonding wood to GRP hull.
« Reply #13 on: July 18, 2017, 12:51:27 PM »

The ones I have used are Nail and Seal , Sticks like Sh t, and St ix all. . I used Nail and seal on my carrier to stick down plastic card to light ply way back in 2009 and it is still in place. Stix all  to glue motor mounts and ply into a plastic hull. Like all adhesives if not sure then give technical a call. The above examples are not under great loads or stress. So if not sure make a call. I have no wish to  change how our what you use to glue items in your project.

Stan.
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Stan

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Re: Adhesive for bonding wood to GRP hull.
« Reply #14 on: July 18, 2017, 12:54:48 PM »

HI Bob the ones I have listed are not resin based products.

Stan
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Seaspray

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Re: Adhesive for bonding wood to GRP hull.
« Reply #15 on: July 18, 2017, 01:43:11 PM »

Cheers Stan
I just used no nails on the caravan and it looks different from using it years ago also said it needed 24 hrs to fully set again unlike years ago it set in 10 mins

Muliputt I've bought 2 pkts first in the 80s and it was solid when I got it so it was a bin job Second one lately it seems to take a
time to mix and felt hardish So I've bought  Alteco's EpoPutty this is to be used for making parts from a mould. I'll be using it soon on the Scotia build

I've still haven't used  the hot glue gun for modelling
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nemesis

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Re: Adhesive for bonding wood to GRP hull.
« Reply #16 on: July 19, 2017, 08:46:23 PM »

I use gel coat to stick wood to glass fibre. It works for me all the time. Never had a failure. nemesis
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