Just found this from 2013... Removing old sealants completely will usually give you better results. But be careful with this part as the original roof below all the old sealants could be badly rusted, making this easy repair not so easy. Wow, never heard of that. That would really ruin my day. I was...

75 Marshfield Northern MN - Snow/Ice Getting close to 70, kind of tired of going up there. 8) It might be just me but this water based stuff just doesn't work near as good as the old asbestos sealers. Also, water based does zilch for rust. Luckily I only have a few small spots of light rust I'll san...