hello, this car (94 899c) a few weeks back, no mot at the moment, any way when i first got it it had this white gunk (see pic) and im bit worried, in its service history it has had a cooling system stop leak, so at first i thought it was antifreeze built up where it leaked, so i cleaned it off. only now its back with beads of moisture. anyone know if this is just a leak or something major?