Originally Posted by
Stew Denton
Mike, I am no expert on finishing either, but do have a couple of thoughts.
I definitely like the Danish Oil option, I use it on fir projects that I care about. It helps bring out the grain and even the grain. Fir will never be curly maple, but I have built projects out of it because of the relatively low cost, and I think the Danish Oil gives the fir a very nice appearance. It brings out the grain, but at the same time prevents the "in your face" appearance that you often get on untreated fir that has been given a medium to somewhat dark stain.
If you go with stain or dye, I think poplar may be a little like white pine, in that the stuff will really sop up the stain, I don't know if uneven absorbance of the stain at the growth rings will make for a blotchy job that shows too much contrast, but the Danish Oil first, sometimes followed with some sort of sealer thinned way down, like 10% urethane in 90% paint thinner, THINLY brushed on will help even out how the lumber takes the stain, and cut down on the blotchiness. One thing on this, let the Danish Oil have a lot of time to cure, but remember that it actually soaks down into the wood. I say this, because the thinned finish will potentially strip out some of the Danish oil. That grain in your poplar is beautiful. The Danish Oil will help bring that out, and make it even more beautiful.
The thinned urethane (or some other type of finish) helps because you are blocking, to an extent, how much faster the soft part of the growth rings absorb the stain as opposed to the harder part of the growth rings, so you get a much less striking contrast. The thinned urethane soaks into the lumber when you put it on and partially seals the lumber, of course soaking into the softer part of the growth rings more than the harder parts. That "absorbed and cured" thinned urethane partially blocks how fast the softer parts of the wood will soak up the stain, thus partially blocking the softer parts of the grain from disproportionally getting drastically darker than the harder parts of the grain, because more of it will be in the softer parts to help seal them more. You don't want to use un-thinned finish, because the idea is just to get partial blockage of the absorption of the stain, not total blockage.
What ever you decide to try, with regards to finish, try it on some scraps FIRST, a scrap big enough to see what it will look like, such as a 1X4 a foot long. If you don't like the first try, plane it off the scrap, and try another approach. I can absolutely tell you that this approach is easier to fix than fouling up the piece itself and having to fix and start over. Now how would I know that?
Stew