Quote:
Originally Posted by Paulporsche
From the yellowish color it looks like the old glue may be contact cement. You can buy contact cement thinner, which would help soften it for removal. You may have to scrape it with a plastic putty knife once softened. Varsol or other paint thinners would probably also work.
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This, when i was doing my interior in a couple spots i found that new contact cement actually activated the old leading to a condition where neither would stick. You will want to make sure all of the old glue is cleaned up.