I think the answer is no.
Are you talking about air-drying clay, like this from Amazon? I believe that will eventually dissolve in water. It's also not a ceramic clay and will feel and behave differently than actual ceramics.
Certainly if you're talking about forming something with a ceramic clay body and then letting it dry to a bone-dry stage, that will dissolve in water (and will be brittle and not very strong) unless it's fired.
here's my first attempt with the air-dry clay and rubber bands: https://imgur.com/a/MJtmkVO
the clay is still drying, but dry enough for a proof of concept pic. once the clay is fully dry, I'd add more rubber-bands to ensure stability. I have quite a bit of clay left, so I may build another if I feel the ledge could be a little higher or extended out a bit more
without this ledge, my pinkie flails around to balance the rest of my hand while I'm playing and it puts a lot of weird stress on it. my pinkie will start going numb after just 20 minutes of play time. I imagine its not healthy. this ledge eliminates that problem. everyone's hands are different shapes and sizes though. could just be a me problem.
here is the clay I am using: https://www.amazon.com/dp/B001GAP4YA?psc=1&ref=ppx_yo2ov_dt_b_product_details
i use air dry clay:
https://www.amazon.com/gp/product/B001GAP4YA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
easy to manipulate and dries hard over night.
i use air dry clay and clay sculpting tools to get into the gaps/seams and fill them in. if you are careful, it all disappears once you prime. works wonders
I used 5kg of DAS modelling clay DAS 1kg Modelling Clay - White https://www.amazon.co.uk/dp/B001GAP4YA/ref=cm_sw_r_cp_api_glt_fabc_YY27YK7Y8MXSS2TR1ZT2?_encoding=UTF8&psc=1
I‘m starting out as well, found this really nice air dry clay, 2 pounds, and it cures in 24 hours. I don’t know how useful it would be for modelling animals/creatures, but so far I have noticed it’s good for sculpting rocks and simple scenery. My only problem with it is that the edges tend to curl up as they dry, so maybe try and flatten the edges as much as you can.
​
https://www.amazon.com/gp/product/B001GAP4YA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 this works good for general work and decent detailing, cheaper than green stuff as well
I used this clay: DAS Air-Hardening Modeling Clay, 2.2 Lb. Block, White Color (387500) https://www.amazon.com/dp/B001GAP4YA/ref=cm_sw_r_cp_api_i_.vWLFbQR1K7B9
That’s a lot of clay, you’re not gonna need a lot of it unless you’re making other customs as well though. I like it because it’s a 24 hour air dry so you get plenty of time to mold it. I’ve found that it hardens enough after 8 hours if you want to get to painting sooner.
Any type of ACRYLIC paint works fine, I’ve been using what I have at home. Though I recommend picking an assortment pack so you can mix for the color tones you want, especially for Taylor’s hair so it’s not too yellow. For the paints, go for whatever your price range is. Any acrylics will work, it’s just a matter of which colors you want. Also, apply multiple thin coats as opposed to one big thick one. That’ll make the brush strokes less obvious and eventually disappear. Actually I’d watch this girl’s tutorial, the way she breaks everything down is super helpful even though she’s making a different Funko: https://youtu.be/sLx71v45M_0
The video breaks it down, but the final main piece to get when you’re done is a matte spray: Rust-Oleum 327862 American Accents Spray Paint, 12 Oz, Matte Clear https://www.amazon.com/dp/B078WM1CVS/ref=cm_sw_r_cp_api_i_EGWLFbE0207NF?_encoding=UTF8&psc=1 The effects are pretty invisible but it does give your pop a uniform look very similar to an official funko. It also helps keep your paint from chipping overtime, and makes the Funko more comfortable to hold. Good luck! :)
I'm using Prang Das air-dry clay, and it's been working well so far. It's not terribly expensive and is easy to paint.
Here is an example of the results. Note that the quality ain't too great because I've never sculpted before. I don't know what I'm doing, and I'm figuring this out as I go along.
I'm sure in the right hands, and with actual tools, it'll work a lot better.