Wouldnt you rather replace the jute with something that doesnt absorb water/moisture. As far as I see that is what a lot of the z's floorpan rust is from, horsehair staying wet for long periods of time. You could use a closed cell foam (XLPE or EVA), which will not absorb or let any water pass thru it. Its not as easy to use as the material or jute but it is lighter and a similar price to the jute (in Oz anyway). But lets hope well keep the moisture out of the car in the first place. FWIW 260Zed