When you say polyurethane I hope you mean you are doing interior doors. An exterior polyurethane is pretty much only available at a professional supplier. For an exterior door a marine grade spar varnish should be used.
Are the streaks brush marks? The best way to eliminate brush marks in oil based polyurethane is use some Flood Penetrol in the varnish and use as soft of a paint brush as you can find. Then apply the varnish as thin as possible with as few strokes as possible. The more you brush it the faster it sets up and the finish needs to flow together before it sets up. The Penetrol will slow down the drying time a little so it has a better chance to flow together.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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