Add fillers to thicken the expoxy to the desired consistency for a specific job. Unmodified resin / hardener has the consistency of syrup and runs off vertical surfaces (suitable for coating and wettting out porous surfaces). By adding filler, a "thicker" consistency can be achieved (suitable for filling cavities, fillets, making large, uneven bondings and for use as a filler). Microfibres 403 is especially suitable for laminating.