Is it alright to use polyurethane over boiled linseed oil for an Ash project? Some parts of the project (AV equipment rack) have been "ebonized" (Speedball brand gives very nice results - jet black) and I am planning to protect them with a Minwax polyurethane. For the other ("non-ebonized") parts of the rack, I am planning to use boiled linseed oil - again with a polyurethane coat. Does this sound reasonable?
In the past, I've used paste wax over boiled linseed oil (for a cherry project); I don't think it's reasonable for some parts of this project to have a wax finish and other parts to have a polyurethane finish - which is why I ask. I also don't think a full wax finish (i.e., wax over both the ebonized and boiled-linseed-oiled parts) is a good solution. Is it?