Can someone recommend a show re-water-proofing spray? I have a pair of trekking shoes bought fromDecathlon few yers back (out of warranty now) that are no longer waterprof.

Try coating your shoes with paraffin

Do you have a link?

@clever-salesclerk-88021 Rustoleum sells a spray called NeverWet. We have used it on shoes and they are quite effective. There should be a video on the product page + you can search on Youtube.