i use F1 the ultimate metal polish. there is three grades to it, fine medium and coarse but i recommend the medium its your best all purpose polish. phone sapphire at 780 435 3222 and they can tell you who sells it closest to you or ship it out !
what is the cost, and do you start with the medium and finish with the fine?
also once you have polished your tunnel do you apply a wax to protect & keep the shine?
F1 polish or gord's polish......... F1 ultimate polish is the best i believe, and they have 3 types(fine, medium, coarse)..... Fine and medium come with waxes in them.......