This article and video will show Notaries to fill out each part of a notarial certificate, and common mistakes to avoid. An essential element to performing a notarial act is completing the notarial certificate, where your signature and seal will be placed.Pad of 100 certificates, including helpful instructions on how to properly fill out the certificate. This self-inking Washington notary stamp is convenient to use on documents that contain no acknowledgement notarial wording or notarial certificate. Application Process. To become a notary in Washington, you must: Submit the following to the Department of Licensing: Click here to begin the application process. Yes, a Washington affidavit can be notarized in another state, provided certain conditions are met. This procedure allows someone legally entitled to inherit a decedent's personal property to get that property without going through probate. Follow the instructions below to complete Washington affidavit form online quickly and easily. Take advantage of DocHub, the most straightforward editor.