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You can add coins to a paper wallet many times.

What is considered risky is spending only a fraction of the paper wallet, for the following reasons:

- you just used the private key for creating a transaction, so the chances of it being compromised increases

- the client you used might have sent the change to another address while you're thinking the remaining coins are still in the paper wallet

But if it's done well, yes, it's possible to spend a fraction of a paper wallet.