Guys can Anyone recommend a company that does waterproof covers for caravan seating .
We're using throws at the moment which are a pain in the backside .
Not sure I've ever heard of anyone wanting waterproof covers for caravan seats, ordinary reupholstery is rare enough, so you may not be flooded with answers!
But a Google will find numerous companies making custom fitted (waterproof and otherwise) covers for outdoor/patio furniture cushions, that may be your best bet.
As a possible alternative, there are off the shelf car back seat covers for dog owners, I've had a couple to protect my seats from my dog, a caravan bench seat is not so different in size to a car back seat.
I've been using throws on my caravan benches for years, to keep the dog fur off the upholstery, never seem to be a problem. Sufficiently oversize to tuck in and keep in place. Not even a problem when I convert benches to beds, just untuck the throw from backrest when that is removed.
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