Hi,
I'm new to the forum but also to the whole world of buggies.
Ours was a barn find, been stored for 24 years.
I started work on the body last year.it has been under a tarpaulin for the last 4 months and now the body has come up in hundreds of water filled blisters! Any ideas please.

Welcome Dutchman, sounds as if your sander will be flying more than you, like any paint job, it's all in the prep, don't forget the mask, nasty stuff fibreglass dust and keep the area ventilated , use the newbie area to learn how to post photos, and then advice will be coming in from all directions- any idea on what model the buggy is ? Good luck with the project fella

welcome and good luck with the project,
when you say you started work on the body what do you mean,, general patch repairs? have you been sanding back the gelcoat and then just thrown a cover over?  or re-painted and coverd up as hudge says its all in the prep,
if damp has go into any open pours in the gelcoat or fibergalss this can cause the bubbling similar story for paint, all can be fixed with elbow grease
Rich.

Welcome. Photos always get more responses.

Try Photobucket and let us see what you are grappling with.

Sounds like micro blisters, fibreglass bodies , in fact painted surfaces in general dont do well covered for long periods with tarps where the paint cant breathe. Are they uniforml over the whole body? Any adhesion problemssuch as micro blistering can only be remedied by stripping off all the existing paint, if you just sand off the tops of the blisteres and prime and paint , then there is a very good chance they will return. There are various isolators that seal the surface to save stripping but with mixed reviews. Fibreglass , like aluminum is hard to get paint to adhere to which is why it is reccomended to strip old paint, etch prime, primer and then paint. It is worth doing paint prep right once, thant trying to cut corners and hoping for good results. Good luck. 

Welcome, reads like you need a proper light car coverwith vents to keep it dry and aired.

Just a few words from an old guy who has, as an amateur, been spray painting cars, a buggy or two, and other things....

Previous posts mention two things...  Preparation and take the time to do the job once. I know from my early days what it`s like to put on the top coat, all shiny and nice, only for major issues to develop after only a week or two. 

With fiberglass you have one great benefit. It doesn`t rust Preparation... I would say this is no less than 80% of the total time. I use cellulose paint 99% of the time. Acrylic the rest. The shiny top layer of the body, if not already over painted, is the "gel coat". Under this the layers of fiberglass. If your buggy was over painted when you got it simply bite the bullet and "sand back until all this paint is removed.  Remember all primers, excluding 2 pack, are porous. If you leave primer uncovered for just a short time moisture will pass through then you have this under the top coat and this will eventually cause issues. If you cover a top coat with a tarpaulin you will ruin the surface with scratch marks.

As the other lads say. Put some photo`s up. I am relatively new to the forum but can say it`s brilliant. There is sufficient knowledge to get you to where you want.
As for tools to do a full respray.... I and another member started our painting decades ago with nothing more than a cheap electric sprayer and with a bit of practice you can get 1st class results.

Hi guys,
Thanks for all the responses - would seem I have lots of elbow work to do. Strangely the areas I have worked on dont seem to have Neen to badly affected. Will try and post some pictures of the buggy and the 'measels'.
Will also introduce myself in the newbie area. Thanks again for the advice.