If a conveyance to a purchaser under section 38-10-103 or 38-10-104 is made before the person making the same is entitled to execute his power of revocation, it shall nevertheless be valid from the time the power of revocation actually vests in such person, in the same manner and to the same extent as if then made.
C.R.S. § 38-10-105
For a conveyance determinable at the will of the grantor being void, see § 38-10-103; for the validity of the power to revoke a conveyance and reconvey, see § 38-10-104.