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I want to fibreglass an aluminium motorhome. Is it possible>>>>

 
Anonymous Coward
User ID: 19139162
Australia
12/28/2012 07:38 PM
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I want to fibreglass an aluminium motorhome. Is it possible>>>>
I bought an old motorhome and after I got it home discovered the roof in a terrible condition. I have started gouging the fill from past bad fixes so I could reseal and paint with total sealer. It is a big job.
So I bought fibrglass kit. There is not much stuff on the internet about fibreglass adhering to powdercoated aluminium.
Any handy people here who might know,
1. Do I still have to gouge out the rubbish and reseal the joins before I lay the fibreglass?
2. Do I have to prime the van first-will it still stick if I don't?

I know it's an odd thread but could really use some help with this.
Thanks

iamwith
Anonymous Coward (OP)
User ID: 19139162
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12/28/2012 07:40 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
hf
Chef.

User ID: 31032031
United States
12/28/2012 07:45 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
I bought an old motorhome and after I got it home discovered the roof in a terrible condition. I have started gouging the fill from past bad fixes so I could reseal and paint with total sealer. It is a big job.
So I bought fibrglass kit. There is not much stuff on the internet about fibreglass adhering to powdercoated aluminium.
Any handy people here who might know,
1. Do I still have to gouge out the rubbish and reseal the joins before I lay the fibreglass?
2. Do I have to prime the van first-will it still stick if I don't?

I know it's an odd thread but could really use some help with this.
Thanks

iamwith
 Quoting: AwakeInTassie


Need to try a RV site.
Anonymous Coward
User ID: 30760504
United States
12/28/2012 07:48 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
just sand the aluminum first.
Anonymous Coward
User ID: 10372663
United States
12/28/2012 07:50 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
I've tried to repair 32 Ford fiberglass bodies that had aluminum framing without success BUT the factory did it some how.

After getting it mechanically sound you may just want to spray on a bed liner like used on truck beds. It will seal and lends to better protection from things like hail.



Good luck you'll get er!!!!!!
TheCartel

User ID: 29735768
United States
12/28/2012 08:11 PM

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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
Can you provide a pic? Would really help
Anonymous Coward
User ID: 1549678
United States
12/28/2012 08:13 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
I've tried to repair 32 Ford fiberglass bodies that had aluminum framing without success BUT the factory did it some how.

After getting it mechanically sound you may just want to spray on a bed liner like used on truck beds. It will seal and lends to better protection from things like hail.



Good luck you'll get er!!!!!!
 Quoting: Anonymous Coward 10372663


This works good
Anonymous Coward
User ID: 30840959
United States
12/28/2012 08:31 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
If you get a Pop Rivet gun and a drill bit of the right size,you should be able to rejoin the seams easily, a little silicone in the joint before riveting should ensure a water tight joint.
You can do this for about $20.
Fiberglass will be too expensive and will weather off.
G. House

User ID: 31044083
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12/28/2012 08:34 PM

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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
I have never tried to adhere fiberglass to aluminum.

But...

I have painted a lot of aluminum professionally.

The problem with aluminum is that it is an extremely active metal the very top layer combines with oxygen IMMEDIATELY when exposed. This is why sanding doesn't really work.

Oh...

and when I say it combines with oxygen, what happens is it forms a layer of aluminum oxide which just doesn't adhere well to paint or glue.

To get around this you use what is called a conversion coating.

First you sand it with very rough sandpaper to provide some "tooth".

Then you use a cleaning agent to remove any grease, oil or dirt rubbed in by the sanding process.

Then you brush on the conversion coating (the stuff I used would give the aluminum a golden yellow tinge.

Then you liberally rinse off the the residue.

Let it dry.

Then apply your fiberglass as soon as possible.

Go to your local automotive paint store and ask them about it.

However...

This might not be a good idea, ie fiberglass to aluminum.

I have a feeling the coefficients of expansion will be radically different.

I ran into this problem making some signage years ago.

We had sandwiched some .40 aluminum to 3/4" plywood in cutout shapes. This was done in a relatively warm shop at about 60 degrees F. Some of the pieces were about 2 inches by 10 feet long. On the day of installation it was about 10 degrees below zero F. The long pieces that were flat in the shop had about a 5 inch bow in them after they got cold.

So what I'm saying is that if you have temperature swings the materials working against each other could cause it to come apart.

Hope I haven't confused you entirely.
"Everybody lies."
Anonymous Coward
User ID: 3560831
United States
12/28/2012 08:46 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
I want a bullet proof pecker...
chowan

User ID: 31047312
United States
12/28/2012 09:03 PM

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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
gawd why would you even want to try


think rather rivets,sheet aluminium and silicon

top it off with some paint on roofing bitumen if you need to
sheell be right mate
Anonymous Coward
User ID: 1139115
Canada
12/28/2012 09:03 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
check out boat forums--aluminum pods on fiberglass boats
and fiberglass pods on aluminum boats...

overwhelming majority do not recomend the two because of the expansion diferential.
but I have read some threads on guys that have done it...

i can't remember the excat outcome/conclusion.

its not the greatest.

---i wouldn't try to adhear the biberglass

--let it "float overtop.

or

if your rig is stationary---why don't you use rolled roofing and tar.

or

patch, then cover the patched area plus a little more with rolled aluminum, "liquid metal ", and rivits

good luck
Dr. Pickle
User ID: 12313542
United States
12/28/2012 09:14 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
Grace Ice Shield.


Its an adhesive rubber sheet that is made to put on the first 4 feet of a homes roof. Its very strong, non permeable, and flexible. It will seal your hole.
Anonymous Coward
User ID: 23018188
United States
12/28/2012 10:53 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
I've tried to repair 32 Ford fiberglass bodies that had aluminum framing without success BUT the factory did it some how.

After getting it mechanically sound you may just want to spray on a bed liner like used on truck beds. It will seal and lends to better protection from things like hail.



Good luck you'll get er!!!!!!
 Quoting: Anonymous Coward 10372663


Yep this post above sounds good, you can also get this white liquid rubber called cool roof coating from Home Depot or Lowes this would work the best, don't use fiberglass..

Also check out the web site forum called RV.net, lots of good info for all RV's..


seal
Anonymous Coward
User ID: 14899405
Australia
12/28/2012 10:57 PM
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Re: I want to fibreglass an aluminium motorhome. Is it possible>>>>
Wow. Thanks for all the responses. Looks like I won't be trying that then.
I have a thing called roof proof to paint on. That was mt next option.
Really thank you all.I knew Glp would make it easier to understand.

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