Refer my comments under this thread. Basically, almost any substance conducts heat better than air in a confined space, also that’s what these potting compounds are primarily used for.
It’s soft, can be dug out with tweezers or similar tools. I purchased this silicone potting compound for repairing my washing machine circuit boards, it’s generally easy to remove and re-pot.
Since the soft silicone itself absorbs some of the stress, I don’t think it’s too necessary to have very specialized equipment to remove all the air bubbles, but you can still try to remove some of them by heating them up with a hair dryer etc.
My advice is still that if there are no exposed components, there is no need for silicone potting.
Actually, I don’t even really like that these potting compounds conduct heat, the LED give off more heat and it may heat up the components on the driver through these compounds, this may have unintended effects or advance temperature control step-down on lights like the Q8+.