I used the 417 (I think) west system filler - whichever is the cream coloured one. I stained the gaboon ply with a Feast Watson floor stain, mixed to a custom colour. Then masked out only leaving the grooves. Filled grooves with the epoxy 417 faring mix, followed by 3 coats of West System ultra clear epoxy on all sides/edges, and finished with 3 or 4 costs of a gloss polyurethane for UV stability. Probably overkill for the old girl but I love the look😁