What is the best course of fixing the u bend on the sink? ...

If I tile my laundry room tonight, how...
Answers:    If you must just fix and not replace the best item is electrical tape. Once in that is no more water or condensation you wrap it with electrical video over lapping the cassette about 1.2 the distance each wrap. Electrical video works because it is not pores. Don't even think Duct video water will be in motion through that like a sieve or a strainer. Back within the day I did this plentiful times on many traps for a speedy fix. It will work.
How to variety wooden cornices? Length is 90...
Replace it.