I have a new utility trailer with a treated pine bed. In order to help it last as long as possible, I am considering treating with a water repellant. I know that Thompson’s Water Seal is very heavily advertised, but that usually means it is more expensive than other similar products. Does anyone have any suggestions of a suitable product that I might wish to use. Appearance is not a major factor, but I do not want to use a coating with pigments. Thanks