I want to paint my over 20 year old cabinets. They were very cheap cabinets to start with and were in the house when I moved in here.They are dark wood. The question is ,do I need to sand them down first or can I just wash them with denatured alcohol first? And should I use a gloss paint or a semi gloss? I dont't know what would look good in an 85 year old house.Hate to start the job and then realize I should have done something differant.