Bailey Pegasus GT65 Rimini external water ingress into caravan base

[Steam]

I have a 2015 Bailey Pegasus GT65 Rimini . Underneath at the rear and sides looks like white patches along the edges of the black ply floor .
Is there a company in north east England that has a remedy to arrest this and seal it to stop it going any further ?

 

[borderbilly]

Derwent valley caravans do repairs, Rowlands Gill.