Does anyone know of a shop you can rent space that has an industrial sized planer? Looking at building a 4’ round resin slab table and the planer would help as mine is a small one.
It is very unlikely that anyone with that capability will chance running a 4' diameter table top with resin no less through a planer. You might have a chance getting somebody to run it through a wide belt sander but you will pay at least the cost of a new belt for every grit you request. Be prepared
It should be very close to dead flat if done correctly. But you will have small ripples depending on what combination of resin you pour. Especially across 4' of table top. I use the high density MDF which is nice and flat so you start nice and smooth and you locate it on a level pouring surface.The new Rivercast from System Three is absolutely gorgeous but is pricey, and meant for deeper pours on river type tables.They have other options for thin surface pours.