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Author Topic: I have a question about fibreglassing.  (Read 474 times)

Rene T

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I have a question about fibreglassing.
« on: January 18, 2018, 02:55:38 PM »
About 4 years ago, I removed the shroud off my AC (air conditioner). When I turned it over, I noticed several cracks in the shroud . The color of the shroud is black so it may be ABS.  I made repairs  by scuffing the surface real good and applied a couple layers of fiberglass/resin. It looked good at the time. I took the shroud off today and all the glass was just hanging there ready to completely fall off. What did I do wrong? 
« Last Edit: January 19, 2018, 10:15:45 AM by Rene T »
Rene, Lucille & co-pilot Buddy
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Molaker

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Re: Inhave a question about fibreglassing.
« Reply #1 on: January 18, 2018, 03:12:02 PM »
Do you recall if you used Polyester, Vinyl Ester or Epoxy Resin?  I'm no expert either, but I'm pretty sure it makes a difference depending upon what the original base material is.  If you were like me some time ago, I just used some Polyester resin available at the local auto parts store and it was a poor choice for repairing my epoxy resin fiberglass boat.
Tom & Joyce and Ditto the "don't tell her she's a dog" Westie
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Rene T

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Re: Inhave a question about fibreglassing.
« Reply #2 on: January 18, 2018, 03:16:22 PM »
Do you recall if you used Polyester, Vinyl Ester or Epoxy Resin?  I'm no expert either, but I'm pretty sure it makes a difference depending upon what the original base material is.  If you were like me some time ago, I just used some Polyester resin available at the local auto parts store and it was a poor choice for repairing my epoxy resin fiberglass boat.

I have no idea Tom. If I was back home, I could find the can of resin and let you know.  Maybe I'll go to a auto parts store some day and see what they say. Or a body shop.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

JackL

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Re: Inhave a question about fibreglassing.
« Reply #3 on: January 18, 2018, 06:18:22 PM »
First; I am thinking that the shroud was plastic, (poly) in which case regular two part epoxy won't work on plastic.
Secondly, a few years back, West Systems came out with "G-flex" epoxy which indeed will adhere to not only plastic but also to wood and metal.

 I race Kevlar, fiberglass and poly canoes and kayaks and do all my own repairs and swear by the G-flex for small quick jobs on any of these surfaces. I also wet out fiberglass cloth with it for larger repairs

Jack L

NY_Dutch

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Re: Inhave a question about fibreglassing.
« Reply #4 on: January 18, 2018, 06:56:29 PM »
Dutch
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Oldgator73

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Re: Inhave a question about fibreglassing.
« Reply #5 on: January 18, 2018, 07:27:23 PM »
Have you considered replacing the shroud, Rene?

http://www.icondirect.com/categories/RV-Exterior-Parts/Air-Conditioner-Shrouds/

 :)) :)) :)) you stole my thunder. My shroud came apart on the 5th wheel and I just bought another one.
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Rene T

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Re: Inhave a question about fibreglassing.
« Reply #6 on: January 18, 2018, 08:35:03 PM »
Have you considered replacing the shroud, Rene?

http://www.icondirect.com/categories/RV-Exterior-Parts/Air-Conditioner-Shrouds/

No I haven't Dutch. The cracks aren't big. They are small and I was just looking to reinforce the shroud on the inside to stop the cracks from expanding. Thanks for the link. I'll keep that in mind. I didn't know they'd be that cheap.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

NY_Dutch

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Re: Inhave a question about fibreglassing.
« Reply #7 on: January 18, 2018, 08:38:56 PM »
No I haven't Dutch. The cracks aren't big. They are small and I was just looking to reinforce the shroud on the inside to stop the cracks from expanding. Thanks for the link. I'll keep that in mind. I didn't know they'd be that cheap.

The Icon Direct shrouds are also tougher than OEM shrouds. They make a quality product...
Dutch
2001 GBM Landau 34' Class A
F53 Chassis, Triton V10, TST TPMS
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox base plate

Rene T

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Re: Inhave a question about fibreglassing.
« Reply #8 on: January 18, 2018, 08:44:28 PM »
The Icon Direct shrouds are also tougher than OEM shrouds. They make a quality product...

I did read that Dutch.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Corky

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Re: Inhave a question about fibreglassing.
« Reply #9 on: January 19, 2018, 06:29:52 AM »
About 4 years ago, I removed the shroud off my AC (air conditioner). When I turned it over, I noticed several cracks in the shroud . The color of the shroud is black so it may be ABS.  I made repairs  by scuffing the surface real good and applied a couple layers of fiberglass/resin. It looked good at the time. I took the shroud off today and all the glass was just hanging there ready to completely fall off. What did I do wrong?

Just a wild guess on my part but it sounds to me that the products you used for the repair didn't have any UV protection.
I use West systems quite a bit and I'll add something for UV, or use a paint that has protection.

Corky
'05 Itasca Meridian 36G
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Gary RV_Wizard

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Re: Inhave a question about fibreglassing.
« Reply #10 on: January 19, 2018, 08:19:18 AM »
I had a corner/edge dent (hit tree branch) in one of mine, and the shroud was definitely not fiberglass. More like a hard vinyl.  I was able to heat it and literally hammer it back out.

For a crack, you may be able to use plastic welding techniques, which could be as simple as running a soldering iron along the crack. Or try using Acetone or MEK to solvent-weld it.

This article has some suggestions:
https://makezine.com/2017/02/16/plastic-repair/

Or maybe this: http://www.plastex.net/
Gary
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Rene T

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Re: Inhave a question about fibreglassing.
« Reply #11 on: January 19, 2018, 08:44:19 AM »
Just a wild guess on my part but it sounds to me that the products you used for the repair didn't have any UV protection.
I use West systems quite a bit and I'll add something for UV, or use a paint that has protection.

Corky

The repair was done inside the shroud so it never saw the sun.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Corky

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Re: Inhave a question about fibreglassing.
« Reply #12 on: January 19, 2018, 10:02:56 AM »
At a previous place of employment we were instructed to clean and prep certain parts that we manufactured with MEK.
After a couple people complained of side effects the MEK was dropped and we started using Acetone.
Understand that this was in the late '70s early '80s, and at that time MEK was on the hazardous material list as a know carcinogenic, but in 2005 it was removed from the list. However I still today avoid it if I can.

As the owner of 3D printing equipment I can tell you that when printing with ABS I use a tip temperature of 245c, just to give you an idea of temperature range you'd need if you decide to try the welding route. Also if you decide to try and weld let me know and I will send some filament to use as I have plenty on hand --- and I have some in black too.

Good luck

Corky   
'05 Itasca Meridian 36G
15 Jeep Wrangler Orange toad
'86 Suzuki Samurai Camo dirt toad

blw2

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Re: I have a question about fibreglassing.
« Reply #13 on: January 19, 2018, 10:53:10 AM »
As Gary suggested
Try MEK on it.
If it's ABS, MEK will dissolve it.

Get some ABS material (lego bricks, some filings form a scrap pipe or fitting perhaps....) and dissolve some in a small amount of MEK to make a paste, and fill the crack after stop drilling it and beveling open the edges of the crack.  The MEK will evaporate leaving a solvent weld.

I read an article once a long long time ago in an aviation magazine.  A lot of general aviation planes used ABS sheet as a molded trim panel covering all sorts of interior areas, fairings over door handles, etc...  These have sort of a leather like texture.  The article showed how to use some sort of putty....maybe something like bondo resin, I can't remember.... to mold an undamaged area of the texture.  Then that mold could be used to press into the fresh repair....matching paint and it was as good as new
Brad (DW + 3 kids)
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