Of course it will void the warranty.
Liquipel does
NOT void your warranty in the US.
Under US law there are only 3 reasons a warranty can ever be voided:
1. If you cause the damage that you are seeking to have repaired (but if you cause damage to the product and want something unrelated repaired that is still fine). Note: manufacturer has to demonstrate with clear and absolute proof that your damage caused the defect you want repaired, they can't guess that it did and they can't assume that it did. This is why Apple was sued and had to pay millions for automatically voiding warranties on devices that tripped the water sensor, because they assumed any defect was a result of water damage, and did not prove anything.
2. If you modify the device in a way that makes it prohibitivly expensive to repair, such as gluing it shut.
3. Non standard use, ie if you use your phone to record video on a weather baloon you send into space, and it's damaged by cosmic rays that's not covered. This is rarely enforcable though as long as you keep your mouth shut.
The FTC has repeatedly clarified that you are allowed to modify your device and apply liquipel and rip off labels that say "warranty void if seal broken" and do whatever you want. So long as you aren't trying to get a manufacturer to fix something you broke, as modifications can count as damage.
The overwhelming majority of manufacturers proceed illegaly and do not follow the law, and void your warranty with their own internal policy. If they bring this up, simply point out it is againt the law.
Yes, I have sued manufacturers over unjustly voided warranties and won. Most manufacturers and most people have incorrect misconceptions about what is and is not legal in voiding warranty work.
Also it is not legal to void an entire warranty ever, each claim must be addressed and denied seperatley, so if they deny 1 claim you can make others. So if you break the screen ask it to be repaired, and they refuse, they can't refuse to fix deffective buttons which you did not damage.
Hope that helps.