Hi Terry
My Expanda had a leak that caused the inside paint to crack and flake off over an area of half a square metre.
The silicone sealer that goes around the top outside of the roof was professionally removed and replaced and the 4 corner plastic mouldings were also replaced and resealed.
That was 12 months ago and since then there has been no leak (the caravan is not kept under cover so is subject to whatever weather comes this way).
A commercial painter was employed to scrape only the cracked/flaking paint away, give the exposed timber ceiling panel a sanding, apply an acrylic undercoat/sealer and then apply the topcoat paint using a small foam plastic roller that resulted in a textured surface that blends in perfectly with the existing paint on the ceiling.
To match the colour a large flake of paint was taken to the paint shop.
The paint used is Haymes acrylic enamel ultratrim high gloss white. The label on the tin says 'Tinter C, J, L and the paint formula says '0, 0, 4/8, 0, 0, 5/8, 0, 1, 1/8.
I don't recall the cost of resealing but the painting cost $300, all up much cheaper than replacing the roof panel.
Unless you look very closely at the finished job you wouldn't guess that it wasn't original, I am very happy with it and keen to go caravaning again as soon as the C-19 crisis is over.