???? Did you really do this, submerge something that has electronics in water and paint thinner? Really? I'm sorry but that just really blows my mind. Please don't take this wrong but common
sense dictates that is just very very wrong. I really am sorry that your Provari is dead but I think that you have learned a very valuable lesson about what not to do. Maybe try something a bit less expensive till you get the hang of electronic cigarette use.
I feel really bad for you, I know what it feels like to be without a PV.

This equals my thoughts exactly. What WERE you thinking? Paint thinner is extremely harsh on plastic materials and probably melted them like Cinnamon flavor does polycarbonate in clearomizers and clear plastic tanks.
This action warrants serious consideration of having your ProVarinati membership revoked.
The Provari is waterproof for the most part. Just allow one to dry completely and you're good to go. There are two stories here on ECF of perfect examples. One person dropped their Provari in a swimming pool. Another one actually survived an entire wash cycle when left in a pants pocket. Both survived perfectly after being allowed to dry out completely.
Provape actually recommends the alcohol bath for the inner components on a periodic basis as part of the maintainance plan.
My bet is that since you had not used the Provari for so long, the bare metal threads in the battery endcap had become oxidized (similar to rust; appears dark and gritty in the threads.) The end cap is part of the electrical circuit, and any oxidation of the battery cap threads can interfere with that circuit.
A $5 tube of
Noaloxx (an antioxidant) is probably all you needed to get the Provari up and running before you took matters into your own hands to ruin the Provari with paint remover. (The occassional application of Noaloxx or other antioxidant is also part of the Provari maintance plan.)
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Contact Provape to get the Provari repaired. It will likely need new inner electronic components, which would be cheaper than replacing it with an entire new one.
Terms and Conditions However, considering you will have international shipping expenses you may decide to just get a cheaper mod until you've better learned how to care for a high end mod like a Provari.
Standard Service Repair Costs
Replace Window and screws- $10.00
Replace Circuit Board - $65.00
Upgrade to V2 - $20.00
Replace plastic pushbutton - $5.00
Repairs to the circuit board - $25.00
Cleaning - $10.00
Replace top cap - $15.00
Broken Cartomizer Service - $10.00
Return shipping within the USA - $5.00
Return shipping International ~$39.00