Anyone Using Factory Firewall Insulation In Combination with Dynamat/Thermo-Tec?

The factory stuff looks good until it gets wet.
The tar based foil stuff (for lack of better words) sticks better and keeps out the heat better in my car. I have both in cars. I seem to think the tar is better, especially on a hot day but I’m not a scientist. Hold on, they will chime in shortly. Lol!