100% refinancing on non-owner occupied home?

I doubt whether you would get 100% refinancing on non-owner occupied home. You will have to pay at 20% down payment in order to secure a mortgage. If you are unable to give 20% down, then you'll have to go for private mortgage insurance.

we already have the property and an interest only loan with mortgage insurance, what i am asking is about getting a refi on the house that we have rented out and getting it refinanced to a conventional mortgage.

Provided that your financial position hasn't deteriorated and there is still some equity in the properties in total (I'm assuming you have another home the loan is also secured against?).

Otherwise if you have no effective equity a lender will be unwilling to allow a refinance.