What I Did
Hi,I replaced the hull liner on my 27' 3 years ago. What worked the best was to pull off the fabric and then brush off the foam / adhesive using a hand held stiff bristle brush. I tried sanding, scraping wit little progress in 1 day. The bristle brush remove all the rest (3/4) in less than 1 hour.Suggest you cover everything with plastic and tape the plastic to the hull liner. Have a shop vac ready and vac up frequently.I used a Berber rug with water based rug adhesive. Found it was a waste of time to make forms to press the rug into place while the adhesive set. The next day I could hand press any places that were not in firm contact.Bought the rug and adhesive at Home Depot.Looks great - had new cushion made the year before, redid the teak - looks better than new.Hope this helps.Contact me if you need more specificsbob_duncan@juno.com