"peter" wrote in message
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What is the function of pre-stain? What happens if I don't use it?

It helps with the appearance on some woods. Mostly needed for softer woods
like pine, the grain looks better with more depth to it. try a pice and see
how it looks. Mineral spirits work just as well. Rub one on a piece and
then put hte stain on some trated, some not. Make your decsion. Takes but
a few minutes to apply it.


What is the pro/cons of oil based versus water based stain?

Water tends to not darken the wood as much as oil. Water has less odor.
Water will raise the grain and more sanding is needed. Sme look better with
the richness of the oil, other look OK with the water. Personal preference.


Are there products that combine pre-stain, stain, and a clear coat
(polyurethane) in one? It seems a lot of hassle just to stain about 20
feet of moldings.

I like the control of using separate finishes. To me, it is not a hassle to
have the appearance I want and will be looking at for years. If you'd
rather save 20 minutes today, that is your choice.