hi from what I have seen on the youtube clip it sands down very easy with wet and dry. skip the first bit he starts with a bumper then dose the flip front
https://www.youtube.com/watch?v=GXzR17LktSg. I am going to have a look at different options so I will come back to you if I find a good one. I am all for taking the hard work out of the prep work and cost if we can