I have an 11 year old log home with Permachink chinking. There are numerous cracks and pull-apart holes in the chinking. One repair service says we should rip everything out, replace the styrofoam backer and re-chink. Another says that’s crazy, that all we need is a heavy coat of Permachink chink paint to fill and seal the cracks. What do you think? Will the chink paint or additional Permachink adhere to the old chinking? Thanks for your help.