I would advise against putting a plaster on as it stops the air getting to it.
Also if you really need to climb on it, the best way is to get some of the thin strapel tape, make sure the tip is free of chalk, start one side of the nail, go over the nail and round underneath the finger, over the split keeping it nice and tight and them back over the top to the otherside of the nail. A clean tear and press down to make sure its well stuck down. A dab of superglue on the join helps the tape stay properly stuck but you will probably need to change the tape after ever couple of problems so I wouldn't bother. This way, if you get the tape tight enough, you will only have 1 layer of tape over the split which will give you maximum feel but hold the split nicely together and doubled up on the top to hold it on well enough. The downside is you will have to renew the tape frequently.
Try to stay off them sharp crimps!
There is the other method of 1 strip of tape from the second knucke on top run lengthways to the second knuckle underneath and then wrap tape around the tip and again around the finger next to the 2nd knuckle but I don't rate this much as you don't get much feel with it and it uses alot more tape and takes a while to do when properly done.
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