Hi, can anyone suggest a wood coloured flexible filler /caulk type product I can use with an applicator gun to fill the gaps between my victorian floorboards in loungeroom and hallway to cut down on drafts? It would need to be something thick as the gaps are around 4mm wide. The boards have already been sanded and oiled, so it can't be anything too messy or that needs sanding/painting etc. My father has used a Sikkaflex product in Australia but we can't find it here. Many thanks.