i just found out that my 16 year old home has plaster walls on the main level. I found this out because I had a bad spot in the dining room and I called a builder who was also the original owners son. the second owner did a real number on them by putting holes in almost every wall because the home was going back to the bank. so my question is did I ruin them by patching the holes with drywall joint compound, will I notice the patches when I paint? any info would be great thank you