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How many times do I have to Prime the walls before leveling out(the wallof ur. putty)?

From the primer depends on the price/quality, and what is there in the instruction it says. Now select primers a lot, there are plenty to choose.\r but, if the primer is normal, it is enough in my opinion, it is good to walk once, and then let the surface dry overnight. And then again. Two times should be enough. If there is any doubt as in a few hours you can walk again (if good, the expense must after each passage be reduced).\r\n\r\PI during the work on the priming, it is impossible to prevent the occurrence of dust, to carry out dusty work (with a hammer for example), otherwise all down the drain and have to redo it.
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