How do you get a smooth finish with gloss paint?

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There are a few things you can do to get a superior finish when painting with gloss on a surface such as an architrave.

First, I suggest sanding the timber surface with a 240-grit sandpaper and then finishing it off with a 320 or 400-grit. This will take away all the fine timber fibres on the surface. You'll be able to feel it with your fingers how smooth the surface becomes. 

Second is the quality of your brush or roller. Many D.I.Y. enthusiasts skip this important element. A superior brush or roller will produce excellent results. A cheap brush often leaves streaks and loose brush hair along the way. The same can be said for a cheap roller: it contaminates the paint surface with loose fibres.

Third is to allow the paint to cure properly before applying the second coat. If the second coat is put on too early, it will drag the first coat and create a rough surface. Pay close attention to the drying time guide on the paint can.  

Experienced Workshop member Rob @Peggers has shared a handy step-by-step guide How to paint like a professional that should provide further helpful tips for you. - EricL