Keep the roller wet

I was asked by a homeowner why subtle lines appeared in the wall as they looked down it at an angle (the lines were the same width as a 9inch roller).
The reason is because they did not have enough paint on the roller (or on the wall). This happens when the roller is old and dry and some of the paint has hardened and only the paint on the outside of the roller is coming out. This also happens if you have a 1/2 inch roller and you are not loading your roller enough. There is a simple rule that you can follow. Load the roller with paint immediately if it leaves a bare mark and don't press the roller in to the wall. A roller is not a presser. The lines in the wall show up because you may be pressing too hard against the wall and as a result the outside edge of the roller is leaving a wet line (the inside of the roller is getting dry because you are pressing)
I always recommend a 3/4 inch roller if you are using flat, eg-shell or satin sheen (especially flat or eg-shell). It stays wet longer and if you roll through the finish enough you'll get the same finish as a 1/2 inch roller anyway. Save yourself some time, go with a 3/4 inch roller and keep it wet. Clean it well if you plan to re-use it.

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