The problem of creating items in L4D2 with the stripper

[lzvs]

I'm using stripper to create items in L4D2, but the acid sprayed by the SPITTER can penetrate the items and won't stick to the surface. How can I solve this problem?

Code: { "solid" "6" "origin" "855 2943 342" "angles" "0 92 0" "model" "models/props_unique/haybails_farmhouse.mdl" "classname" "prop_dynamic" }