I agree with Mel22
If you want it to look like anything, varnish not cetol . Any UV protective varnish will be fine – as there many “favorites”.
I just re-varnished my IdaSailer tiller. It came with just a light base coat of varnish. I’m in the process of forming a sunbrella cover. If you do make a cover, don’t forget to mount any hardware on the tiller first (Tiller tamer, auto-pilot bracket, extending handle). So, yep, this will be try two.