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We construct examples of diffeomorphisms of 4-manifolds which are pseudo-isotopic but not isotopic to the identity. To do so, we further understanding of which elements of the \"second pseudo-isotopy obstruction\", defined by Hatcher and Wagoner, can be realised by pseudo-isotopies of 4-manifolds. 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We construct examples of diffeomorphisms of 4-manifolds which are pseudo-isotopic but not isotopic to the identity. To do so, we further understanding of which elements of the \"second pseudo-isotopy obstruction\", defined by Hatcher and Wagoner, can be realised by pseudo-isotopies of 4-manifolds. 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