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Old 04-19-2022, 03:22 PM   #1
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Blisters in fiberglass bottom of sidewalls and back

2001 Winnebago Adventurer 35u
i have these blisters pop up all around bottom of motorhome fiberglass ,they open up and peel of leaving hole. anyone else having this problem. i just brought this motorhome,excellent shape otherwise. Trying to send pictures,not to good at this.
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Old 04-20-2022, 08:54 PM   #2
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That sad to hear. The usual cause of "blisters: under the paint on fiberglass is moisture getting into the fiberglass material. It was a common problem with Alfa MH's. I don't remember any good resolution.
I suggest contacting a reputable fiberglass body shop/boat shop and ask for advice.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 04-28-2022, 09:28 PM   #3
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Originally Posted by tjhchief1935 View Post
2001 Winnebago Adventurer 35u
i have these blisters pop up all around bottom of motorhome fiberglass ,they open up and peel of leaving hole. anyone else having this problem. i just brought this motorhome,excellent shape otherwise. Trying to send pictures,not to good at this.
I'm having the same issue. Have you found a resolution?
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Old 04-28-2022, 10:03 PM   #4
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Resolution is first, find where the leak is and fix it. Second, have a RV repair shop, or yourself if you are talented, and peel the fiberglass off the siding and reglue it.
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt PSW inverter/charger. 2013 Elantra on a Master Tow dolly.
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Old 05-13-2022, 06:56 PM   #5
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Fiber glass is fairly easy to work with but getting matching finish is a much harder, on lower body I've done some touch up repairs and was able to buy matching colors online in a spray can, not perfect but can only see if I point out the area. As the previous post said I think DYI is the best option unless it's beyond your comfort level, I always figure if I can make a hole, I can fill it using a wire mesh backing and layer fiber sheets and glass over it. Key is removing all loose material mask of surrounding area if you get back to good solid fiber glass the chances are you will have covered any entry points once set up sanding and smoothing will be time consuming but with care you can do a good job, if you're not happy with result just use a course grit sand paper and rough it up this will give the next attempt a key to lock onto you can also layer a quality body filler on top and finish up with that, I just repaired a fairly large area on my truck with using fiber glass and body filler and it turned out fine just do one area at a time. If you go to an RV dealer you can say goodbye to your RV for a long time unless you're really lucky. should after your DYI attempts fail or just not happy it won't make a body shops job any harder as long as you don't expand the repair any further than getting the damage back to the solid material again. Look online a ton of information that will help give you more confidence.
Good Luck hope this helps.
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