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rvdave
Joined: 24 Jan 2009
Posts: 191
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 Posted: Mon Jul 27, 2015 7:55 am Post subject: Bonding fiberglass to plexiglass |
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Recently I glassed around cabin rear windows after sanding with 80 and wiping with acetone and paper towel. That was about two months ago, now sanding near the taped edge I noticed it peeling up, testing an area showed no bond to plex. Thinking I apparently didn't sand deep enough into plex to get a good bond. Using West epoxy--the glass bonded excellent to the cabin top. I ended up peeling and cutting away unbonded glass to plex for a redo. What went wrong and what should I do for a confident bond? Thinking about using a Dremel or die grinder on plex.
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Dave Ford
Cadillac, MI |
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EdKranz
Joined: 29 Dec 2010
Posts: 132
Location: Hastings, MN
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| Posted: Mon Jul 27, 2015 10:17 am Post subject: Bonding fiberglass to plexiglass |
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Acetone is a big no-no on plexiglass. It can cause crazing, and it kind of melts the plexi. I've used naptha or a PPG paint reducer for all the plexi cleaning. My guess is that the acetone remelted the areas that you sanded, and smoothed them out and the epoxy didn't bond.
On Mon, Jul 27, 2015 at 10:55 AM, rvdave <rv610dave(at)gmail.com (rv610dave(at)gmail.com)> wrote:
[quote]--> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)>
Recently I glassed around cabin rear windows after sanding with 80 and wiping with acetone and paper towel. That was about two months ago, now sanding near the taped edge I noticed it peeling up, testing an area showed no bond to plex. Thinking I apparently didn't sand deep enough into plex to get a good bond. Using West epoxy--the glass bonded excellent to the cabin top. I ended up peeling and cutting away unbonded glass to plex for a redo. What went wrong and what should I do for a confident bond?
--------
Dave Ford
RV6 for sale
RV10 building
Cadillac, MI
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Ed Kranz
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Mon Jul 27, 2015 11:47 am Post subject: Bonding fiberglass to plexiglass |
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Kerosene is also a good cleaner for plexi if needed.
Tim
On 7/27/2015 1:13 PM, Ed Kranz wrote:
| Quote: | Acetone is a big no-no on plexiglass. It can cause crazing, and it kind
of melts the plexi. I've used naptha or a PPG paint reducer for all the
plexi cleaning. My guess is that the acetone remelted the areas that you
sanded, and smoothed them out and the epoxy didn't bond.
On Mon, Jul 27, 2015 at 10:55 AM, rvdave <rv610dave(at)gmail.com
<mailto:rv610dave(at)gmail.com>> wrote:
<mailto:rv610dave(at)gmail.com>>
Recently I glassed around cabin rear windows after sanding with 80
and wiping with acetone and paper towel. That was about two months
ago, now sanding near the taped edge I noticed it peeling up,
testing an area showed no bond to plex. Thinking I apparently
didn't sand deep enough into plex to get a good bond. Using West
epoxy--the glass bonded excellent to the cabin top. I ended up
peeling and cutting away unbonded glass to plex for a redo. What
went wrong and what should I do for a confident bond?
--------
Dave Ford
RV6 for sale
RV10 building
Cadillac, MI
|
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Mon Jul 27, 2015 12:42 pm Post subject: Bonding fiberglass to plexiglass |
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Urethane paint reducer is the ticket on plexiglass. I found it in the literature for the Lord adhesive that Geoff recommends. Does a nice job without risk to the plexi. If I recall correctly, I think the plexi is supposed to be sanded with 200 or 220 grit sandpaper before epoxy/fiberglassing. While I use 80 grit to sand to shape, I generally go over that with 220 before wiping clean and starting the glass work.
On Mon, Jul 27, 2015 at 12:43 PM, Tim Olson <Tim(at)myrv10.com (Tim(at)myrv10.com)> wrote:
[quote]--> RV10-List message posted by: Tim Olson <Tim(at)myrv10.com (Tim(at)myrv10.com)>
Kerosene is also a good cleaner for plexi if needed.
Tim
On 7/27/2015 1:13 PM, Ed Kranz wrote:
| Quote: | Acetone is a big no-no on plexiglass. It can cause crazing, and it kind
of melts the plexi. I've used naptha or a PPG paint reducer for all the
plexi cleaning. My guess is that the acetone remelted the areas that you
sanded, and smoothed them out and the epoxy didn't bond.
On Mon, Jul 27, 2015 at 10:55 AM, rvdave <rv610dave(at)gmail.com (rv610dave(at)gmail.com)
<mailto:rv610dave(at)gmail.com (rv610dave(at)gmail.com)>> wrote:
--> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)
<mailto:rv610dave(at)gmail.com (rv610dave(at)gmail.com)>>
Recently I glassed around cabin rear windows after sanding with 80
and wiping with acetone and paper towel. That was about two months
ago, now sanding near the taped edge I noticed it peeling up,
testing an area showed no bond to plex. Thinking I apparently
didn't sand deep enough into plex to get a good bond. Using West
epoxy--the glass bonded excellent to the cabin top. I ended up
peeling and cutting away unbonded glass to plex for a redo. What
went wrong and what should I do for a confident bond?
--------
Dave Ford
RV6 for sale
RV10 building
Cadillac, MI
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eferrer" target="_blank">http://forums.matronics.com
===========
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-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========
[b]
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Kelly McMullen
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Greg McFarlane
Joined: 12 Apr 2012
Posts: 57
Location: Albany Western Australia
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| Posted: Tue Jul 28, 2015 4:17 am Post subject: Re: Bonding fiberglass to plexiglass |
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I had exactly the same result using West Systems Epoxy although prep did not include cleaning with acetone. Just like you (although it looked great) I found no adhesion to the Plexglass with my glass layup over the window to cabin top intersection. When I questioned my West agent they were not at all surprised that the bond had been unsuccessful. Turns out the only product that West recommends for Plexglass is their G Flex. I have since like you peeled off all the glass layup and have routed out around ALL windows and "reglued" with GFlex and 403 filler. Like a lot of 2seat RV builders I have previously used the recommended epoxy 105/206 combo to bond windscreen fairings and they have apparently been successful. However with the flatish RV10 side window experience I now suspect that a lot of these windscreen lay ups have little adhesion to the Plexglass. Because of the curve at the bottom of the windscreen the layup is very tight on the screen and it's hard to see there is no adhesion, but again because the layup is so tight against the screen it's not an issue. Cheers from Western Australia
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Tue Jul 28, 2015 7:18 am Post subject: Re: Bonding fiberglass to plexiglass |
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I think that I used a high quality isopropyl alcohol after sanding with 200 grit. If I remember correctly, acetone was considered a no-no. Don't hold me to it, it was a long time ago.
John
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rvdave
Joined: 24 Jan 2009
Posts: 191
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| Posted: Tue Jul 28, 2015 6:29 pm Post subject: Re: Bonding fiberglass to plexiglass |
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After reading up a little on the G Flex I think I will try it over the plex/ fiberglass intersection, seems made more for dissimilar material bond. Thanks
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Dave Ford
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