Selling your classic car? It's FREE to list your car on Honest John Classics | No thanks

Unknown - Bubbling paint on a GRP bodied classic car

On 4th February 2015, HJ wrote:-

"The problem is Osmosis, common on boats. Moisture has got behind the gel coat. Expensive specialist job to repair and definitely not covered by insurance. "

In response to an enquiry about "Bubbling paint on a GRP bodied classic car" described thus:

"My 1974 GRP bodied classic car was perfect in summer time, and used regularly. When wet weather came in I used two car covers, one soft breathable, and one waterproof, to keep off worst of rain and bird droppings etc.

To my horror the paintwork has bubbled up badly, little humps about 3mm diameter, 1mm high."

IF this is osmosis (which implies that the enquirer is incorrect in referring to "paint") I'd say the enquirer needs to stop using those covers.

Boats are MUCH more exposed to this hazard, since the hulls are continually immersed. They hardly ever show significant osmotic blistering on the topsides, unless its somewhere rainwater is trapped.

If its osmosis it seems very likely the covers are trapping rainwater or condensation against the gelcoat.

Air movement (wind, with maybe some fans inside and/or under the car, if possible, will dry out the structure, and may cause the collapse of some of the blisters.

With boats, a severe case may have the gelcoat stripped, the laminate washed and dried out, and then re-painted with a high-build epoxy/mineral water-barrier coat. That'd be uneccessary on a car, and an acceptable cosmetic appearance would be much harder to achieve.

Asked on 10 February 2015 by edlithgow

Tags: classic cars consumer rights act mpvs suvs used cars

2 answers

peter moss    on 14 January 2017

Yes tell me i owned a Scimitar it had more pimples than a hookers bum !

Add a comment

Related questions
My budget is about £10k. I currently have a 2011 Peugeot 5008 but it's underpowered. I want an SUV with 3 full seats but not a 7-seater. However, they seem seldom to come by. I was looking at a Mitsubishi...
I have a family of five and need space for the occasional DIY building projects. I have a Ford Fiesta and can't decide what to buy. SUV's are all the rage but are expensive and not always practical. MPV's...
I'm tall and have a bad back. I need an automatic vehicle that has easy access and is comfortable. My annual mileage is approximately 3000. What do you advise?
I'm hoping for advice on the best new economical and practical vehicle to buy with a long warranty. Or perhaps advice on the best secondhand model for my needs as an older female drive. My ideal car/van...