Hi Jungui,
General answer :
If the defect is in contact with gas chamber , the resin must be compatible with gas ! For pressure it’s necessary to have pressure equal or more than design pressure ( pressure test / 1.5)(not more hydro pressure for cylinder resistance) and hydro test must be made after repair .
Design condition in our case is 6.47 b.g hydro test pressure 9.7 bar.g B008661.
If supplier consider pressure not sufficient for his resin, it’ necessary that he says.
Otherwise it’s ok
Regards
Denis Bierme
--------------------------------------------------------------------------------