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Old 08-06-2011, 09:35 AM
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Help with air bubbles in fiberglass layup

I've been laying up some fiberglass reinforcing patches over the aluminum tabs on my 'glass tilt front, and until now everything was going well.
However I ran into a problem when I put down the last of three layers. During application I didn't encounter any problems, and I rolled out all of the air bubbles and got a good layup.

The next morning I went to check on the patches and I got a surprise. All of the patches I put down had massive air bubbles in them. I have attached a picture of what happened.

The bubbles seemed to explode all over the layup during curing. I'm using newly purchased vinyl ester resin and MEKP. I mixed up the resin just like I always do according to directions.

Any thoughts as to what caused this? I did the layup in the evening, and the temperature was in the mid-70's, and it wasn't overly humid either. I'm thinking it may have been a combination of temperature, humidity and amount of MEKP I used. Maybe I should have used more hardener based upon the temperature.

Any help would be appreciated,

Steve
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Old 08-06-2011, 09:43 AM
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Quote:
Originally Posted by steve392
I've been laying up some fiberglass reinforcing patches over the aluminum tabs on my 'glass tilt front, and until now everything was going well.
However I ran into a problem when I put down the last of three layers. During application I didn't encounter any problems, and I rolled out all of the air bubbles and got a good layup.

The next morning I went to check on the patches and I got a surprise. All of the patches I put down had massive air bubbles in them. I have attached a picture of what happened.

The bubbles seemed to explode all over the layup during curing. I'm using newly purchased vinyl ester resin and MEKP. I mixed up the resin just like I always do according to directions.

Any thoughts as to what caused this? I did the layup in the evening, and the temperature was in the mid-70's, and it wasn't overly humid either. I'm thinking it may have been a combination of temperature, humidity and amount of MEKP I used. Maybe I should have used more hardener based upon the temperature.

Any help would be appreciated,

Steve

Not sure what happen there.. I do mix to what the temp is.. But.. I would just lightly grind them out a little, Then put a layer or two back over it.. You should be OK..

The cloth might have been a little damp.. or something..
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Old 08-06-2011, 10:17 AM
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i've done the same thing many times. put the last layer on and leave it too soon. mat raises up and pulls in some air.
i would sand it down good and then use cloth instead of mat .

and stay with it until it kicks ........
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Old 08-06-2011, 10:26 AM
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Quote:
Originally Posted by shine
i've done the same thing many times. put the last layer on and leave it too soon. mat raises up and pulls in some air.
i would sand it down good and then use cloth instead of mat .

and stay with it until it kicks ........


I agree with you shine..

But I would use the chop mat instead of the cloth... The cloth is to hard to hide when you paint it.. It will show through..


And this is so true..stay with it until it kicks...
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Old 08-06-2011, 10:41 AM
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that's why barry makes a urethane bed liner....
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Old 08-06-2011, 10:57 AM
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Quote:
Originally Posted by shine
that's why barry makes a urethane bed liner....
But when you try to cover half cloth and half mat... You do know you will see there is a difference where the two meet....(even with bed liner on it) I'm not try to go up a against you here shine... But I do know ''YOU'' know what I'm getting at...

I glassed all my hinge points on my tilt front ends with the same stuff they used to build my front ends with.... I tear all my chop mat so when it's put on,, You will never see anything that look's like you added it... When I'm done.. You will think it was done at the factory..
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Old 08-06-2011, 11:16 AM
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you gotta try some of this bed liner randy . pretty cool stuff. i have an adjustable lizardskin gun that shoots it really good. being able to reduce it makes all the difference.

and yes glass is a pia. i have a spot i've been trying to get rid of for a while. dirty sob just keeps showing back up. round hole in early glass. feathered matted epoxied . if i have another go at it i swear i'm going to lay the whole panel up in vail cloth . but such is the world of vettes .
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Old 08-06-2011, 12:02 PM
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Quote:
Originally Posted by shine
you gotta try some of this bed liner randy . pretty cool stuff. i have an adjustable lizardskin gun that shoots it really good. being able to reduce it makes all the difference.

I can only imagine how great it is coming from Mr.Barry...
He has me hooked now on his stuff.. And most of all,,, His kindness... Great guy to talk to...Believe me !!!! I will give it a try one day...
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Old 08-07-2011, 09:44 AM
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Thanks for the advice guys...I'll try to adjust the mix based upon the temperature and stay with it until it kicks....

Steve
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Old 08-07-2011, 02:28 PM
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Did you mix a new batch as your last layer? If so was it may have been hotter than the previous ones and caused the reaction.
Did you use the MEK to clean the spot prior to applying the patch? if so that is the cause. Clean the spot with acetone, allow plenty of time for it to fully evaporate. As the MEK evaporates it will cause bubbles.
Too many layers applied to quickly will create too much heat during the curing process and bubble as well. Allow sufficient time for cure between layers.
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Old 08-08-2011, 06:50 AM
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I used acetone to wipe down the previous layer and it had plenty of time to flash off. The previous layer was put down days before, so I don't think that was it. I'm thinking that, because of the cool temperature, and maybe the humidity, I should have added a little more hardener to get the mix to kick quicker. I think I walked away from the layup too soon....
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Old 08-08-2011, 12:18 PM
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Quote:
Originally Posted by steve392
I should have added a little more hardener to get the mix to kick quicker. I think I walked away from the layup too soon....


I would think your right...
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Old 08-08-2011, 01:45 PM
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i wont even attempt any glass work right now. there is no mix for 110 . i even put off paint until oct .
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Old 08-08-2011, 05:08 PM
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Quote:
Originally Posted by shine
i wont even attempt any glass work right now. there is no mix for 110 .

Come on shine !!!! It's almost that temp here year around.....
It can be mixed..

Now... if we're talking about grinding fiber glass,,, That may be a little different...
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