Take two at making ATMOS actually capable of fixing ATMOS in a timely…

… manner

code/game/objects/effects/effect_system/effects_foam.dm

@@ -25,11 +25,14 @@
 	metal = 1
 	icon_state = "mfoam"
 
-
 /obj/effect/particle_effect/foam/metal/iron
 	name = "iron foam"
 	metal = 2
 
+/obj/effect/particle_effect/foam/metal/resin
+	name = "resin foam"
+	metal = 3
+
 
 /obj/effect/particle_effect/foam/New(loc)
 	..(loc)
@@ -49,6 +52,8 @@
 			new /obj/structure/foamedmetal(src.loc)
 		if(2)
 			new /obj/structure/foamedmetal/iron(src.loc)
+		if(3)
+			new /obj/structure/foamedmetal/resin(src.loc)
 	flick("[icon_state]-disolve", src)
 	QDEL_IN(src, 5)
 
@@ -230,3 +235,38 @@
 	obj_integrity = 50
 	max_integrity = 50
 	icon_state = "ironfoam"
+
+//Atmos Backpack Resin, transparent, prevents atmos and filters the air
+/obj/structure/foamedmetal/resin
+	name = "ATMOS Resin"
+	desc = "A lightweight, transparent resin used to suffocate fires, scrub the air of toxins, and restore the air to a safe temperature"
+	opacity = 0
+	icon_state = "atmos_resin"
+	alpha = 120
+	obj_integrity = 10
+	max_integrity = 10
+
+/obj/structure/foamedmetal/resin/New()
+	if(isopenturf(loc))
+		var/turf/open/O = loc
+		if(O.air)
+			var/datum/gas_mixture/G = O.air
+			G.temperature = 293.15
+			for(var/obj/effect/hotspot/H in O)
+				qdel(H)
+			var/list/G_gases = G.gases
+			for(var/I in G_gases)
+				if(I != "o2")
+					G.gases[I][MOLES] = 0
+			G.garbage_collect()
+			O.air_update_turf()
+		for(var/obj/machinery/atmospherics/components/unary/U in O)
+			if(!isnull(U.welded) && !U.welded) //must be an unwelded vent pump or vent scrubber.
+				U.welded = 1
+				U.update_icon()
+				U.visible_message("<span class='danger'>[U] sealed shut!</span>")
+		for(var/mob/living/L in O)
+			L.ExtinguishMob()
+		for(var/obj/item/Item in O)
+			Item.extinguish()
+	..()

code/game/objects/items/weapons/holosign_creator.dm

@@ -74,6 +74,14 @@
 	creation_time = 30
 	max_signs = 6
 
+/obj/item/weapon/holosign_creator/atmos
+	name = "ATMOS holofan projector"
+	desc = "A holographic projector that creates holographic barriers that prevent changes in atmosphere conditions."
+	icon_state = "signmaker_engi"
+	holosign_type = /obj/structure/holosign/barrier/atmos
+	creation_time = 0
+	max_signs = 3
+
 /obj/item/weapon/holosign_creator/cyborg
 	name = "Energy Barrier Projector"
 	desc = "A holographic projector that creates fragile energy fields"

code/game/objects/items/weapons/tanks/watertank.dm

@@ -178,15 +178,16 @@
 //ATMOS FIRE FIGHTING BACKPACK
 
 #define EXTINGUISHER 0
-#define NANOFROST 1
-#define METAL_FOAM 2
+#define RESIN_LAUNCHER 1
+#define RESIN_FOAM 2
 
 /obj/item/weapon/watertank/atmos
 	name = "backpack firefighter tank"
-	desc = "A refridgerated and pressurized backpack tank with extinguisher nozzle, intended to fight fires. Swaps between extinguisher, nanofrost launcher, and metal foam dispenser for breaches. Nanofrost converts plasma in the air to nitrogen, but only if it is combusting at the time."
-	icon_state = "waterbackpackatmos"
+	desc = "A refridgerated and pressurized backpack tank with extinguisher nozzle, intended to fight fires. Swaps between extinguisher, resin launcher and a smaller scale resin foamer."
 	item_state = "waterbackpackatmos"
+	icon_state = "waterbackpackatmos"
 	volume = 200
+	slowdown = 0
 
 /obj/item/weapon/watertank/atmos/New()
 	..()
@@ -218,7 +219,7 @@
 	var/obj/item/weapon/watertank/tank
 	var/nozzle_mode = 0
 	var/metal_synthesis_cooldown = 0
-	var/nanofrost_cooldown = 0
+	var/resin_cooldown = 0
 
 /obj/item/weapon/extinguisher/mini/nozzle/New(parent_tank)
 	..()
@@ -238,16 +239,16 @@
 /obj/item/weapon/extinguisher/mini/nozzle/attack_self(mob/user)
 	switch(nozzle_mode)
 		if(EXTINGUISHER)
-			nozzle_mode = NANOFROST
+			nozzle_mode = RESIN_LAUNCHER
 			tank.icon_state = "waterbackpackatmos_1"
-			to_chat(user, "Swapped to nanofrost launcher")
+			to_chat(user, "Swapped to resin launcher")
 			return
-		if(NANOFROST)
-			nozzle_mode = METAL_FOAM
+		if(RESIN_LAUNCHER)
+			nozzle_mode = RESIN_FOAM
 			tank.icon_state = "waterbackpackatmos_2"
-			to_chat(user, "Swapped to metal foam synthesizer")
+			to_chat(user, "Swapped to resin foamer")
 			return
-		if(METAL_FOAM)
+		if(RESIN_FOAM)
 			nozzle_mode = EXTINGUISHER
 			tank.icon_state = "waterbackpackatmos_0"
 			to_chat(user, "Swapped to water extinguisher")
@@ -267,64 +268,59 @@
 	var/Adj = user.Adjacent(target)
 	if(Adj)
 		AttemptRefill(target, user)
-	if(nozzle_mode == NANOFROST)
+	if(nozzle_mode == RESIN_LAUNCHER)
 		if(Adj)
 			return //Safety check so you don't blast yourself trying to refill your tank
 		var/datum/reagents/R = reagents
 		if(R.total_volume < 100)
-			to_chat(user, "<span class='warning'>You need at least 100 units of water to use the nanofrost launcher!</span>")
+			to_chat(user, "<span class='warning'>You need at least 100 units of water to use the resin launcher!</span>")
 			return
-		if(nanofrost_cooldown)
-			to_chat(user, "<span class='warning'>Nanofrost launcher is still recharging...</span>")
+		if(resin_cooldown)
+			to_chat(user, "<span class='warning'>Resin launcher is still recharging...</span>")
 			return
-		nanofrost_cooldown = 1
+		resin_cooldown = 1
 		R.remove_any(100)
-		var/obj/effect/nanofrost_container/A = new /obj/effect/nanofrost_container(get_turf(src))
-		log_game("[user.ckey] ([user.name]) used Nanofrost at [get_area(user)] ([user.x], [user.y], [user.z]).")
+		var/obj/effect/resin_container/A = new /obj/effect/resin_container(get_turf(src))
+		log_game("[user.ckey] ([user.name]) used Resin Launcher at [get_area(user)] ([user.x], [user.y], [user.z]).")
 		playsound(src,'sound/items/syringeproj.ogg',40,1)
 		for(var/a=0, a<5, a++)
 			step_towards(A, target)
 			sleep(2)
 		A.Smoke()
 		spawn(100)
 			if(src)
-				nanofrost_cooldown = 0
+				resin_cooldown = 0
 		return
-	if(nozzle_mode == METAL_FOAM)
+	if(nozzle_mode == RESIN_FOAM)
 		if(!Adj|| !isturf(target))
 			return
 		if(metal_synthesis_cooldown < 5)
-			var/obj/effect/particle_effect/foam/metal/F = new /obj/effect/particle_effect/foam/metal(get_turf(target))
+			var/obj/effect/particle_effect/foam/metal/F = new /obj/effect/particle_effect/foam/metal/resin(get_turf(target))
 			F.amount = 0
 			metal_synthesis_cooldown++
 			spawn(100)
 				metal_synthesis_cooldown--
 		else
-			to_chat(user, "<span class='warning'>Metal foam mix is still being synthesized...</span>")
+			to_chat(user, "<span class='warning'>Resin foam mix is still being synthesized...</span>")
 			return
 
-/obj/effect/nanofrost_container
-	name = "nanofrost container"
-	desc = "A frozen shell of ice containing nanofrost that freezes the surrounding area after activation."
+/obj/effect/resin_container
+	name = "resin container"
+	desc = "A compacted ball of expansive resin, used to repair the atmosphere in a room, or seal off breaches."
 	icon = 'icons/effects/effects.dmi'
 	icon_state = "frozen_smoke_capsule"
 	mouse_opacity = 0
 	pass_flags = PASSTABLE
 
-/obj/effect/nanofrost_container/proc/Smoke()
-	var/datum/effect_system/smoke_spread/freezing/S = new
-	S.set_up(2, src.loc, blasting=1)
-	S.start()
-	var/obj/effect/decal/cleanable/flour/F = new /obj/effect/decal/cleanable/flour(src.loc)
-	F.add_atom_colour("#B2FFFF", FIXED_COLOUR_PRIORITY)
-	F.name = "nanofrost residue"
-	F.desc = "Residue left behind from a nanofrost detonation. Perhaps there was a fire here?"
+/obj/effect/resin_container/proc/Smoke()
+	var/obj/effect/particle_effect/foam/metal/resin/S = new /obj/effect/particle_effect/foam/metal/resin(get_turf(loc))
+	S.amount = 3
 	playsound(src,'sound/effects/bamf.ogg',100,1)
 	qdel(src)
 
 #undef EXTINGUISHER
-#undef NANOFROST
-#undef METAL_FOAM
+#undef resin
+#undef RESIN_FOAM
 
 /obj/item/weapon/reagent_containers/chemtank
 	name = "backpack chemical injector"

code/game/objects/structures/crates_lockers/closets/secure/engineering.dm

@@ -39,7 +39,7 @@
 	new /obj/item/clothing/gloves/color/yellow(src)
 	new /obj/item/clothing/gloves/color/yellow(src)
 	new /obj/item/weapon/inducer(src)
-	new /obj/item/weapon/inducer(src)	
+	new /obj/item/weapon/inducer(src)
 	for(var/i in 1 to 3)
 		new /obj/item/weapon/storage/toolbox/electrical(src)
 	for(var/i in 1 to 3)
@@ -88,7 +88,7 @@
 	new /obj/item/weapon/storage/toolbox/mechanical(src)
 	new /obj/item/weapon/tank/internals/emergency_oxygen/engi(src)
 	new /obj/item/device/analyzer(src)
-	new /obj/item/weapon/holosign_creator/engineering(src)
+	new /obj/item/weapon/holosign_creator/atmos(src)
 	new /obj/item/weapon/watertank/atmos(src)
 	new /obj/item/clothing/suit/fire/atmos(src)
 	new /obj/item/clothing/head/hardhat/atmos(src)

code/game/objects/structures/holosign.dm

@@ -65,6 +65,24 @@
 /obj/structure/holosign/barrier/engineering
 	icon_state = "holosign_engi"
 
+/obj/structure/holosign/barrier/atmos
+	name = "holo atmospheric fan"
+	desc = "A holographic fan that acts as a barrier for atmospheric changes."
+	icon_state = "holo_fan"
+	density = FALSE
+	anchored = 1
+	CanAtmosPass = ATMOS_PASS_NO
+	layer = ABOVE_NORMAL_TURF_LAYER
+
+/obj/structure/holosign/barrier/atmos/New()
+	..()
+	air_update_turf(1)
+
+/obj/structure/holosign/barrier/atmos/Destroy()
+	CanAtmosPass = ATMOS_PASS_YES
+	air_update_turf(1)
+	return ..()
+
 /obj/structure/holosign/barrier/cyborg
 	name = "Energy Field"
 	desc = "A fragile energy field that blocks movement. Excels at blocking lethal projectiles."