does anyone is using a kind of mag fluid bed like that, size will be 3 winch x 4 ?  i 'll be a lil bit too short whit a normal 2 inch tube since i'll also paint some blades that are around 1 5/8 wide. does anyone know if it is possible to make a good one where we can easily switch paint cup instead of cleaning them each time you change paint color ? ive seen some whit union some without.one thing is sure union cost a lot of money vs the rest