What type of grids are the best and why, either porcelain over cast iron, or just cast iron.

I prefer cast iron. Cast iron heats more evenly and retains temperature better. If they are falling apart from rust, junk them. If they just have surface rust and no holes, all you have to do is brush them with a steel brush at high heat. Wipe them off with a wet rag and then rub it with an onion to provide a teflon layer. if it is really heavy rust, spray oven cleaner on them and hose off. After use or for storage, clean them and then wipe them down with a cooking oil soaked rag. The oil will reduce rust build up.

Hello friend, thanks for your post!
It is not recommended to use any cast iron pots or skillets on a Frigidaire smooth top. In your manual it provides the best type of cookware material and cast iron is a poor heat conductor. Due to the weight of the cast iron it can cause scratches or damage the cooktop. I hope this information has been helpful. -Matt

Do not attempt to do this task yourself, you should call a Gas Safe engineer to solve the problem.

Cast Iron by far, ceramic grates chip and are VERY difficult to clean!!!

It's a casting ridge where the porcelain is thin. It got past the qc guy. I'm sure kohler will make it right

If you keep using the range without the aluminum pans it will eventually go away, but aluminum will leave marks on the surface of the grate.

Kohler does have a porcelin touch up or you can get it at Home Depot or Lowe's. Not the best solution but it might help. Comes in a little bottle like White out
Kurt

take digital photos and start the warranty process, it sounds like a poor enameling job.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_aad3edb7dfa380b9

If your tub is porcelain over cast iron and the cast is not cracked your ok. If the cast is cracked then the chances of the crack continuing are great, more so with any vibrations and changes in weight distribution.

You can repair the sink with an epoxy based porcelin kit


Epoxy will not show brush streaks it will levelitself out do not get any kits from HD or Lowes they do not harden

Go to Sherwin Williams and ask for an epoxy paint for porcelin

As for removing the under counter sink
I would try cutting through the caulk adhesive
between the bottom of the granite and cast iron
sink with a hack saw blade
I have used a diamond blade on a grinder and
cut through but it was not a granite counter top
Be extremely areful to suport the underside of the sink with 2x4 blocks to prevent stressing the granite as you cut through
Good luck