I wouldn't recommend cleaning a roller cover and then putting it right back into use again while wet. It would be better to have 2 roller covers, and allow one to be drying while you use the other one. If your roller cover still has a lot of water in it, it will thin the first few feet of paint that you roll, which may affect the coverage and the sheen, and the thinned paint may leave little bubbles in the finish since that's what adding to much water to paint will sometimes do.If you plan to do much painting in the future, I'd suggest you invest in one of the spinning roller cleaner tools, (like this one) that you put the roller on, and then pump the handle to spin it. Best/fastest way to clean out a roller that there is, IMO.After I finish with a roller, I will usually scrape the roller cover clean with a 5-in-1 putty knife, using the concave roller scraper side to squeegee out all the paint from the roller. Keep combing it and turning it until you can't get any more out. Then use the water and just a drop or two of dish soap in a 5 gallon bucket... wring it with your hands a few times, then spin it with the spinner mentioned above. Do this a few times, then change the water and repeat. When you are ready to rinse the cover, I let the hose run in the 5 gallon bucket, and just keep dipping the cover into the clean running water, then pull it out and spin it. After you do this 10x or so, the water in the bucket will be clean, and the roller will be spotless. This doesn't take much time at all, once you get the majority of the paint out, it takes maybe 1 minute to rinse 10x.You don't leave rollers soaking in water. You clean them and shake/spin out all the water you can, then hang them to dry after each use. If you will be using the same color the next day, you can simply get the roller wet with paint and completely cover the roller and pan with a garbage bag or some plastic/poly, folding it so as to keep fresh air out.You also don't generally need to prime walls that have already been painted. Unless this is bare drywall, I would suggest you return the primer and save yourself the $$$ and the time and effort. Your money and time will be better spent applying 2 coats of your wall paint color.And you definitely don't take the roller from the primer and put it in the paint without cleaning it completely first!I assume you know that you need to "cut in" the ceiling edges, baseboard edges, corners and window and door perimeters with a 2 1/2" brush first, prior to getting out the roller. (I like to use an angled sash brush, but a plain straight brush will work too). If you roll 2 coats, you should cut in 2x also. Always cut in 1st, then roll.Masking tape on horizontal surfaces (like baseboard) is a must... mostly to keep any paint splatter off. Runner dropcloths are also a must have. 4x12 is a common size. 4 of them and you're set. Or just one, if you like to move it around a lot.
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