damp repair?

You don't say whereabouts in the front. You have to find out where it's getting in ie:
Could be the front ally strips need to have a mastic bead run down the top edges.

If you do do it then don't cut the nozzle on the sealant leave it with small opening and build up in layers if necessary. Too big hole in the application nozzle makes one hell of a messy job as too much comes out in one go. I've done mine on the front.
Also condensaton can be the cause.

Nobby
March 2009