Our home has pine log siding 6 in. wide by 4.5 in. deep. A few pieces of siding are starting to rot:1. If rot is very shallow, can we just remove rot at surface?2. It is hard to match odd-sized siding. Can we fill a gap with wood cut to size, cover with thinner siding, and caulk gaps? 3. The house is painted. Is paint contributing to the rot? 4. The siding is not caulked. Should we caulk cracks in siding, or leave checks alone as recommended for whole-log houses? Thanks so mu