I applied it straight after taking off the protective film from the factory, following the directions inside. Firstly, I couldn't get the correct backing film to peel off, the second one would always peel off instead of the first. When I finally managed to put it on, the whole area under the protector was riddled with light patches that I couldn't remove even with the included card. I ended up going through both of the included protectors in one sitting, and both ended up the same.
The plastic used in these screen protectors was terrible as well, it felt like a piece of contact film you use to cover textbooks. Honestly thinking of using that now that these are in the bin.
0/10 would not recommend to anyone