There is no limit to use PayPal when funding your casino account to play games. So you can use PayPal as much as you want to. There is no limit to the number of times you want to use PayPal in the casino to enjoy as many games you want be it Slots, Poker, Table Games or Lotto games.
The only thing that you need to take care of is that you should have a sufficient bank balance in your bank account or credit card. If there will be no money or less of money to play games then it will not be possible to transfer money from your Paypal account to your real money account. Suppose you are making a deposit of $500 to enjoy a particular casino game and you have only $450 at your bank account that is linked to PayPal then you cannot do the transaction and PayPal will reject that because of no positive balance on the PayPal account. So do have sufficient funds before you leap to click on the PayPal deposit option at the casino.
Make sure that you always have enough cash available to transfer to the casino real money account to enjoy games. Once you have enough funds you can use PayPal any number of times to play casino games.
Similarly if you have linked your Canadian prepaid card to your PayPal account then that prepaid card should have enough credits and worthiness to fund the casino to the exact amount of your choice to make that deposit.