best way to seal a sump

hi guys wats can i use, My grey sealer not sealing

or wat brand

i had the same problem with my sr20 and later found that the inside edge and the outside edge of the sump was not at the same level so when you put the silicon on in the middel it didnt seal, so with a small hammer and a flat surface i fixed the problem

thanks bud

what sealer, shoul i use

i use the grey stuff the very expencive one