Any syringe that has single milliliter markings will be suitable. One syringe for part A and one syringe for part B. You may want to consider the size of the area you are sealing as that may determine what size syringe you go for.
If you use our handy sealer calculator that will tell you how much you need to measure out for each coat – https://form.jotformeu.com/93314202989360
Regarding the temperature, room temp or above is ideal. If you are sealing today you will have NO worries and it will only need to be at that temp for the time of the initial cure which is a couple of hours after each coat.