Any brush strokes with too much pressure can be damaging but light circular swirling motions need not be and are perfectly acceptable. Mark Watterson from Simpson has confirmed as much on this very web site. The paintbrush type strokes recommended by Simpson are purely advisory I think. At any rate, damage or not, I love swirling.
ah, very good! I don't swirl a synthetic; I grind them! I'm afraid of messing up this expensive brush. Thanks.
I did enjoy the Simpson pictogram instructions of the guy doing it the wrong way; he loses his happy smile!
AA