well, stacking BIZR and PSTE is very strong. if you add SHD4 at the top of your wall, it is become stronger, since it needs a smart bomb to break that. plus if you heat it to 300c,the PSTE dont turn to brick, while the BIZR turns to solid.
try using BIZR then stacking it with insl, blocking PROT efficiently.
Used a Solar Gun to try and get through, but the TTAN and GOLD coverings came off because it was too strong and caused a HUGE pressure blast to come from the wall. BRR: IMPOSSIBLE / 10