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Dear, you can, but only if you sand off the previous paint with sandpaper and then brush it.
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Not recommended,
I can brush it. If you make waterproof mortar on it, you can first paint it with glue or interface agent, and then brush a thin layer of cement slurry on it, and wait until it is firmly combined with the bottom layer, and then you can brush the waterproof mortar on it.
What age are you, still tung oil, and now you brush the varnish again, don't you make yourself happy?
You can no longer apply latex paint to the wall tiles directly, and you must shovel off the wall paint before you can paste the wall tiles again.
In this case, it is generally necessary to wear a glove to take out the brush and throw it away, otherwise it will not be good if the toilet is plugged
Yes, but it is better to paint the topcoat after the primer, so that the wear resistance and hardness are much better.