How do all,

Anyways just a quick question. Theres a car on the market I'm interested in but unfortunately I cannot raise the funds for at least a month or so. So I was wondering, if I send him a deposit via paypal (in order to keep the car and I buy it when I can which we both agree with) is it secure? I'm pretty sure the guy won't pull a fast one but before I do I want to know how safe/secure it is in doing so.