Sanded stripes

Epoxy filler

Sea-line white epoxy filler, consumption about 1,5 kg for the whole deck.

Routed grooves

6mm width with a router, depth approx 1,5 mm. The deeper the cut the more filler you will need. 

Deck sanded and primed

150 g Epoxy primer Sea-line for one layer (2 layers with in-between sanding). This closes the grain and the risk being stained by white filler is reduced.

Back side deck planked

Good result to close the gap between planks is to hammer it in softly having the wedge like shape.