Hi Bex,
As you probably know there are two types of pva, with polyvinyl acetate being wood glue and polyvinyl alcohol amongst other things is used as a release agent.
Being new to flying and this forum I obviously never met Ross. This is my first post and it is to offer my condolences.
It was obvious to me reading his posts that he was very knowledgeable, experienced and a good guy who was keen to offer his knowledge to others and I am sure the aviation community will miss him. My prayers go out to his family and friends.