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I think you will find a 'primer/filler' base coat and then a finish coat both of good quality brush paint will seal it.

Hi Neddygirl , can you tell how much water has got in , has it been dripping off the ceiling , are the ceiling boards damp to touch or do they have soft patches . What you need to do straight away is stop any more water getting through the pin holes , i would cover with gaffer tape , but this gives a problem of removing the glue when the tape is removed , you could try aluminium tape , but it's silver so it will show . Apart from that it's a case of filling the pin pricks with caravan tube mastic ( use a good quality mastic not cheap stuff ) or try some of the idea's from others above .
Another other thing that's a long shot is go to a sign maker ( the type that makes stick-on graphics for cars etc ) and see if they can supply sheeting that could be stuck on the roof to cover the holes , they may even have a colour of plastic sheeting that closely matches your caravan colour . I've had graphics made up in the past and they stay stuck , as well they have a plastic covering to the graphic ( if you know what i mean ) .

Hope the idea's help .
Let us know how you decide to repair your holes .

atb

Wizard

Hi

 How did you get pin holes in your van?

When we have had a leek we have used the aluminiom tape for an emergancy so we could find out later where the water is coming from.

I probably should of mentioned that our van was bought as a damp wreck and completely stripped and refited (every single panel of a 19ft van, roof as well). The damp was origionaly mainly caused by poor seals at joints where the awning rail goes but then pin holes (mainly in the roof, a few in the side) formed I think from a reaction between the now damp steel fastners in the frame and the aluminium shell. I don't know if you ever get the pin holes without some other underlying problem...

You can buy paint from Cara-Match to cover up whatever sealant you use, which is what I planned to do but have not got round to yet! If you see a Challenger with grey patches it's probably us ;-)

I used Acrypol because a friend who does comercial buildings maintenance swears by it for patching up roofs and it can be applied in the rain which is often when you find the holes!

Jon.