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Hello @danscodellaro
Welcome to the Bunnings Workshop community. It's marvellous to have you join us, and thanks for sharing your question about getting a smooth finish when painting architraves.
There are a few things you can do to get a superior finish on your architraves. Firsts, I suggest sanding the surface with a 240grit sandpaper and then finishing it off with a 320 or 400grit sandpaper. 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 will become.
Second is the quality of your brush or roller. Often times a lot of D.I.Y. enthusiast skip this important fact. 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 very rough surface.
Here is a handy step-by-step guide: How to paint like a professional by @Peggers
If you need further assistance, please let me know.
Eric
