I purchased about 15 gallons of Rodda Weather Performance exterior flat latex neutral paint, #51 1204 5. Trouble is, it wasn’t until getting it home and trying it on a swath of our house that I realized it isn’t white, but neutral base. I am hoping you can tell me what I need to do/add to make this useable as a white exterior house paint. Is there an additive white tint I can purchase and, if do, where? Please help! Thank you.