It tends to dry with a yellow tinge.
I shall give it a go with PVA, not watered down, see if I can get a decent balance. When I've tried PVA before for foliage it just takes too long to dry and the foliage falls off regardless of how well it's supported. If I do it in two stages with the support sitting in a tub of foliage until it dries, maybe that'll work.