what grit to use when sanding before actually using it?

As long as it is a lower grit # than the stone, it will work. But obviously the lower the number the faster it will work. I used a 200 grit paper and it took me about 10-15 minutes overall to flatten both sides. I wouldn't go much lower than 100 grit though, it may be too rough of a grit that it could cause some grooves that you wouldn't be able to see, but would still affect whatever you're sharpening.All you need to do is get some dry/wet sanding paper (walmart, lowes, home depot, OSH, anywhere that sells sandpaper will have it) that is around 200 grit. Find a flat surface that you can put the paper on, wet the paper with some water to act as a lubricant, soak your stone till it is saturated with water, and then put the stone on the paper and work at it till you're satisfied that it is flat on both sides. Make sure the area you're working in will be ok if it gets wet, and have extra water ready to rinse the paper and stone with periodically because a lot of the stone will be rubbing off onto the paper. Hope this helps, and good luck!

You should flatten Norton every? How do you know it's not flat anymore?

I would not use a flattening stone as they usually aren't flat. Course or extra course dmt stones will be your best bet. Norton Stones will not come flat from the factory they must be flattened. The easiest and best way to know if its flat it's to take a pencil and make grid lines each way.up and down, and across every half inch or so. Then use coarse diamond stone to flatten it. You will see when the grid lines are all gone that your stone is completely flat. When you first start to rub the stones together you will notice the low spots are still marked with the grid lines. Once all grid lines have been removed do it once more and your stone should be flat. Also once you flatten your stone you should take your diamond stone and slightly round the edges of your Norton stone. There should be many videos on this on youtube

I left mine in water over night will it be OK or will it disbond ?

I wouldn’t do that too often. 15-20 minutes is plenty.

I recently got into straight razor shaving and I need stone for honing. Do I need to buy flattening stone now or is ready to use for now ?

Send your razor out for the first honing. Dovo razors do not come shave ready. I recommend you get Naniwa super stone in 1000, 5000, 8000, 12,000. You will also need a diamond lapping stone. Naniwa makes one, DMT makes one. If you hone your own razors, it is not going to be inexpensive. You will also need a strop or paddle strop. Get a 3 inch because you won’t have to do X strokes to strop your razor. A good strop should cost you $75 to a$100. If you only have 1 or 2 straight razors, you may wish to have them honed instead of purchasing all the stuff you will need to hone your razor’s. If you decide you like straight razor shaving then you need to learn to hone. I use a straight every day since I retired. I learned to shave with a straight razor in1962 so I know what I’m talking about. It will take you 100 shaves to get good at this. Don’t get discouraged. It’s the best shave you will ever get.

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💎 Sharpen Like a Pro, Shine Like a Boss

DUAL GRIT MASTERY - Switch effortlessly between 4000 grit for edge maintenance and 8000 grit for mirror-polished perfection.
TRUSTED CRAFTSMANSHIP - From Norton, a St. Gobain brand known for premium abrasives trusted by professionals worldwide.
SECURE SHARPENING SETUP - Blue hinged box with no-slip rubber feet doubles as a stable holder, ensuring safety and precision.
PERFECTLY SIZED FOR PROS - Compact 8 x 3 x 1 inch design fits seamlessly on your workbench for consistent sharpening sessions.
WATER LUBRICATION ADVANTAGE - Sharpen with water, not oil—cleaner, eco-friendly, and hassle-free maintenance.

The Norton 24336 Japanese-style combination waterstone features dual-sided 4000 and 8000 grit surfaces for both refining and ultra-fine polishing of steel edges. Sized at 8 x 3 x 1 inches, it’s designed for bench use with water lubrication for easy cleanup. Its blue hinged box with no-slip rubber feet ensures a stable sharpening experience, making it a must-have tool for professionals and enthusiasts aiming for razor-sharp precision.

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Material	Stone
Brand	NORTON ABRASIVES - ST. GOBAIN
Colour	Blue
Item Weight	930 g
Grit Type	Extra Fine
Number of Items	1
Manufacturer	St. Gobain Abrasives
Global Trade Identification Number	00614636243368
UPC	094704143699 614636243368
Model number	61463624336
Product Dimensions	20.32 x 7.62 x 2.54 cm; 929.86 g
Item model number	61463624336
Item Height	1 Inches
Item Width	3 Inches
Are batteries included?	No

Norton 24336 Japanese-Style Combination Waterstone 4000/8000 Grit, 8-Inch by 3-Inch by 1-Inch

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