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Author Topic: Fibreglass tissue hull  (Read 480 times)

Paul1

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Fibreglass tissue hull
« on: May 03, 2021, 11:37:16 am »

Hi just finished the hull of a slec police launch which is a lot stronger construction than the Aeronaut classic i built and didnít fibreglass the hull, can I just sand seal prime and paint or do you recommend I fibreglass the hull ,Iíve never done it before and a bit worried about making a mess of the hull thanks

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Stan

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Re: Fibreglass tissue hull
« Reply #1 on: May 03, 2021, 12:15:39 pm »

PM sent .


Stan
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Paul1

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Re: Fibreglass tissue hull
« Reply #2 on: May 03, 2021, 12:56:30 pm »

Hi Stan once again thank you for good advice and help you have given me itís much appreciated
Regards Paul
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Stan

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Re: Fibreglass tissue hull
« Reply #3 on: May 03, 2021, 08:14:11 pm »

I have been asked why my answer to Paul 1 was by pm?  The answer was quite simple leave well alone he was not confident in carrying out this operation. For any one in the same position if your are not confident at carrying out this type of work leave well alone. I do share any information on this and other sites to help others but sometimes a pm is more personal than wading through oceans of answers that a newbie may not understand




Stan. :(( :(( :(( :(( [size=78%]   [/size]
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Martin [Admin]

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Re: Fibreglass tissue hull
« Reply #4 on: May 03, 2021, 08:54:17 pm »


You could always do a couple of practice runs on something else first....  :-)
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dougal99

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Re: Fibreglass tissue hull
« Reply #5 on: May 03, 2021, 09:15:30 pm »

I agree with Martin (well there's s first  ;D ). Have a go on a practice piece. If you don't try you'll never know what you can do. I  have used fibreglass tissue on several of my boats but there was a first time, so give it a go.  :-))
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Stan

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Re: Fibreglass tissue hull
« Reply #6 on: May 03, 2021, 09:29:22 pm »

Thank you all for the replies but Paul1 is not confident at this stage to have a go.
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dougal99

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Re: Fibreglass tissue hull
« Reply #7 on: May 03, 2021, 09:38:25 pm »

That's why I said use a practice piece. Nothing ventured nothing gained.
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Martin [Admin]

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Re: Fibreglass tissue hull
« Reply #8 on: May 03, 2021, 10:08:10 pm »

That's why I said use a practice piece. Nothing ventured nothing gained.

    :-)) :-))

        First time for everything!   ok2
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Andyn

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Re: Fibreglass tissue hull
« Reply #9 on: May 03, 2021, 11:12:51 pm »

You learn nothing by giving up %)
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Stan

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Re: Fibreglass tissue hull
« Reply #10 on: May 03, 2021, 11:38:46 pm »

You could go on about this forever. You are either confident at carrying out this operation our not. Not everybody is confident especially a novice builder who is concerned over making a mess of his project. The model is a very strong construction and should not need fibreglass applying. There is a small amount of balsa on the bow which should pose no problems.
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John W E

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Re: Fibreglass tissue hull
« Reply #11 on: May 04, 2021, 09:46:29 am »

Interesting subject this is.   Especially today when we have several variants of resins such as polyester, epoxy resins, then Eze-Kote resin which is water soluble and the two previous ones are not.


First of all, I think we have to decide why we are actually coating the hull?  It depends what the hull is actually made from; under normal circumstances the softer the material that the hull exterior is made from and the more water absorbent it is.  The greater the need to put a barrier on the exterior of the hull - so basically the hull itself should be strong enough and not need any re-enforcement of fibre glass material.  We should only use it as a barrier.  Having said that, there are many balsa wood hulls and brown gum-stripped hulls which have had a paint & sand n sealer coating and sometimes a shellac coating to protect the exterior - and they are still around today from many years ago - a tribute to the build.


So, if the hull is made from a good strong birch ply in theory we should only be required to fill the gaps where mistakes were made in the joints of the hull skin with some form of filler and then fill the grain of the plywood with some recommended filler and then carry on finishing the hull with the paint or varnish.   No need to try and add extra strength with tissue mat or woven roving and resins.


The main thing people seem to fall down on is whether to coat the inside of a hull as well the exterior and the answer I think should be yes - as wooden material when damp tends to swell and if a plastic material has been used to coat the exterior to form a barrier - it will not expand when it's damp.   Therefore the wood may have a tendency to break away from this exterior barrier.   If we coat the interior of the hull as well as the exterior we are preventing any dampness entering the timber, therefore preventing any swelling/movement of the wood.


Regarding confidence and working with resins - confidence is only gained by trying as everyone knows - so therefore as has been suggested it does pay you to practice on a scrap bit of wood.   Especially today with the water soluble resins, if it is going wrong we can always quickly wash it off with warm water and soap - as I have done myself in the past.


That's my thoughts :-)


John
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JimG

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Re: Fibreglass tissue hull
« Reply #12 on: May 04, 2021, 12:45:06 pm »

With a ply hull there is no real need to fiberglass the hull as the surface is quite strong. However I would coat it with epoxy surfacing resin (I use Deluxe Materials Aeropoxy) this will soak into the wood surface and harden it and give a good surface to sand down. I also add some microballons (tiny glass or resin bubbles), just enough to thicken it slightly, better less than too much. This makes it easier to sand and fills the grain so that one coat of epoxy does the job to give a smooth surface, it can then be easily painted. Using paint to fill the grain needs several coats wet sanded between each to properly fill the grain. The epoxy should also be applied to the inside to waterproof the wood. Aeropoxy is mixed by volume so a medicine measuring cup does the job.  The measurement does not need to be exact it will still harden although it might take longer.Some epoxies need to be mixed by weight so accurate scales are needed.If you are confident enough to use paint then you can use epoxy, it goes on in the same way using a brush.
Jim
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RST

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Re: Fibreglass tissue hull
« Reply #13 on: May 04, 2021, 10:21:57 pm »

Would I skin a hull with fibreglass tissue -absolutely not. Would I do it with a skin of cloth and resin, absolutely!  It's such a very easy thing to do.  It takes very little skill at all. It's not essential but given what's offered in terms of coatings theses days hard not to do it, certainly and absolutely not hard at all for a beginner!! More work in building the thing than trying it as a final layer or painting it. And as a belt and braces it should never go wrong.
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Martin [Admin]

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Re: Fibreglass tissue hull
« Reply #14 on: May 05, 2021, 03:36:58 am »


Anyone found a decent instructional video yet?     :-))

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Martin [Admin]

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Re: Fibreglass tissue hull
« Reply #15 on: May 06, 2021, 12:01:14 pm »


Someone found these for us....



 
 
 
 


 
 
 
 
 
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