I have a surface made of wood (teak to be exact) I need to take a mould from it. However, I CANNOT damage the original. That means no sealers, primers, fillers, waxes etc. Will PVA alone be a good choice for this? The surface looks quite porous...

Once I've been advised by someone who suggested to use kitchen plastic paper (the one used to wrap food, u see ?). Never tried it though.