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Old 05-13-2018, 04:44 PM   #1
FAKKY
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Fibreglass Patch

Hi guys

My 1sy bondo fibreglass patch didnt set up right.
Dont think I got my mixture ratios correct - its tacky and not hard.

Not sure if can be fixed. Or start over ??

I tried using heat to reactivate it - but that seemed to make it softer with the heat .... and then it setup much the same.

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Old 05-13-2018, 06:44 PM   #2
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Re: Fibreglass Patch

it should have setup pretty quick...if it hasn't then youll have to remove it and start over...
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Old 05-13-2018, 08:19 PM   #3
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Re: Fibreglass Patch

dangit ....... somehow I knew that would be the answer

not sure what I did wrong ...... but I did half ass measure ..... so must be it.
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Old 05-13-2018, 10:19 PM   #4
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Re: Fibreglass Patch

First step: Take it all off as there's nothing you can do to reactivate it.
Second step: Throw the remaining product away unless you are working on a boat or a Corvette or a Cameo.
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Old 05-13-2018, 10:24 PM   #5
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Re: Fibreglass Patch

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Originally Posted by Foot Stomper View Post
.........
Second step: Throw the remaining product away unless you are working on a boat or a Corvette or a Cameo.

Well said.
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Old 05-13-2018, 10:27 PM   #6
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Re: Fibreglass Patch

Lol

And use what instead ?

This is to cover-up pinholes and small holes where I can't really weld without blowthrough as so thin ....
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Old 05-13-2018, 11:29 PM   #7
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Re: Fibreglass Patch

where is the area your trying to fix?...remove and replace is the best way to fix.....
if you have access to the backside you can use a copper backer and weld up the holes...metal needs to be clean to do this .....
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Old 05-13-2018, 11:41 PM   #8
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Re: Fibreglass Patch

If the metal is very thin with holes, any kind of filler you put on top will not fix it and will fail to adhere in a very short time because moisture will continue to invade and more rust will ensue which will cause any repair material to crack and bubble and fall off... even fiberglass.
I'm afraid you don't have any options but to replace the metal with good steel and do a proper repair.
Anything less than this approach will be a complete waste of materials and your time.
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Last edited by Foot Stomper; 05-13-2018 at 11:51 PM.
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Old 05-14-2018, 10:22 AM   #9
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Re: Fibreglass Patch

Quote:
Originally Posted by mongocanfly View Post
where is the area your trying to fix?...remove and replace is the best way to fix.....
if you have access to the backside you can use a copper backer and weld up the holes...metal needs to be clean to do this .....
HI
Yep I used the copper trick on most of teh welds.
Just stuff where its too tight to get a copper piece tight against the metal on backside.

For the doorjam pillar support area down to the actual step on passenger side
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Old 05-14-2018, 10:23 AM   #10
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Re: Fibreglass Patch

Quote:
Originally Posted by Foot Stomper View Post
If the metal is very thin with holes, any kind of filler you put on top will not fix it and will fail to adhere in a very short time because moisture will continue to invade and more rust will ensue which will cause any repair material to crack and bubble and fall off... even fiberglass.
I'm afraid you don't have any options but to replace the metal with good steel and do a proper repair.
Anything less than this approach will be a complete waste of materials and your time.

Its 98% metal patches in.
Pic here.

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Old 05-14-2018, 11:45 AM   #11
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Re: Fibreglass Patch

Turn your welder down, then real quick tacks to get them filled in. Move around and take breaks to keep the heat down in the metal.

Then get a quality epoxy primer and brush it over your seams to get any unseen pin holes.

Last edited by sprint_9; 05-14-2018 at 11:56 AM.
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Old 05-14-2018, 12:43 PM   #12
FAKKY
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Re: Fibreglass Patch

Quote:
Originally Posted by sprint_9 View Post
Turn your welder down, then real quick tacks to get them filled in. Move around and take breaks to keep the heat down in the metal.

Then get a quality epoxy primer and brush it over your seams to get any unseen pin holes.
Whats a good epoxy primer thats not crazy $$

https://www.eastwood.com/eastwood-gr...4aAlwTEALw_wcB

?
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Old 05-14-2018, 01:06 PM   #13
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Re: Fibreglass Patch

Quote:
Originally Posted by FAKKY View Post
Whats a good epoxy primer thats not crazy $$

https://www.eastwood.com/eastwood-gr...4aAlwTEALw_wcB

?

PPG Omni MP170(gray), MP171(white), MP172(black)

http://us.ppgrefinish.com/PPG-Refini...-Refinish/Omni
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Old 05-16-2018, 07:20 PM   #14
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Re: Fibreglass Patch

Quote:
Originally Posted by FAKKY View Post
Whats a good epoxy primer thats not crazy $$

https://www.eastwood.com/eastwood-gr...4aAlwTEALw_wcB

?
Any and every epoxy primer does the same job. Just be sure you are buying 2k epoxy primer and some other epoxy enriched or other misnomer.
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