Any such contract or bill of sale as is mentioned in § 11-1, if in writing and signed by the owner of the property, shall, from the time it is duly recorded, be, as against creditors and purchasers, as valid, so far as it affects real estate, as if the contract were a deed conveying the estate or interest embraced in the contract and, so far as it affects goods and chattels, as if possession had completely passed at the time of such recording, provided that, as to goods whose possession is retained by a merchant-seller, the provisions of subsection (2) of § 8.2-402 of the Uniform Commercial Code shall be controlling and provided further that, if any such contract or bill of sale as is mentioned in § 11-1 creates a security interest as defined in the Uniform Commercial Code, its validity and enforceability shall be governed by the provisions of that Code.