If you don't mind losing a few brain cells, you could use the trim solvent Top Flite makes for just such an application. Once it dries, it's permanent (bonds the two). You use a soft cloth or paper towel to squeeze out bubbles once it's in place, let it dry and you're done.

Soapy water works, but is not permanent (unless you hit it with an iron afterwards, but it may bubble). This method has the big advantage of being "adjustable" when wet.

When it's all done, I like to seal the trim with clear gloss (I like Aerogloss which of course is fuel proof) if the edges of the trim lies on a high traffic area (like the leading edges where your hand likes to grab). And sometimes I do it to blend the edges together.