yes they can, but you must be more carefull when doing this because single stage paints are very easy to burn through if your an ameture or weekend buffer. If you paint has been cured go get a wool pad and some meguires NO.7 and buff it out. Wetsanding is only needed if the paint has flaws like runs, orange peel etc etc. I do beleive there is a how to in the KB on buffing, if not there are a few different posts on how to buff correctly in the past pages of this section.
HK