well my FIL bought 2 cypress swings and finished them with minwax polycrylic even though i told him not to. well the finish has begun to turn white so now he wants to redo them. a local hardware store owner suggested Hellman's spar varnish, which i agree is a good choice. the question is, does he need to remove all the water based polycrylic first or can the spar varnish go over it?
thanks for any help