How do I paint blocks?
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What kind of blocks do you have?
If you are talking about toy wood blocks, you will need a non-toxic stain or paint because kids will chew on them. If you are asking about concrete blocks in a wall, then you should prime/seal them and then roll on a good quality paint (brushing grout lines).
I believe Ken has provided the answer, it would be good to have more information ie type of blocks, just saying.
If it's cinderblocks that's tricky as they absorb everything. They would need sealed before painting.
If it's wood blocks that's different and you can just paint them.