Sounds like two things. First, it sounds like you are not overlapping with your next coat. You should use a progressively wider blade with each coat or do it wider with the same blade and completely cover the previous coat so it looks like you only have one wide coat in the end. That makes it a lot easier to sand and makes for a smoother finish.
Second, any ridges will be caused by lumps in the compound or a bump on the wall. Always sand before and after you apply spackle or drywall compound. A flat drywall sander is a MUST in any painters toobox. Some will sand betwen coats, but when you get good at it you can just go along knocking down ridges between coats with a blade.
Second, any ridges will be caused by lumps in the compound or a bump on the wall. Always sand before and after you apply spackle or drywall compound. A flat drywall sander is a MUST in any painters toobox. Some will sand betwen coats, but when you get good at it you can just go along knocking down ridges between coats with a blade.
