diff --git a/code/game/objects/items/stacks/medical.dm b/code/game/objects/items/stacks/medical.dm
index d1d208db08..4973670f71 100644
--- a/code/game/objects/items/stacks/medical.dm
+++ b/code/game/objects/items/stacks/medical.dm
@@ -15,12 +15,12 @@
 
 /obj/item/stack/medical/attack(mob/living/carbon/M as mob, mob/user as mob)
 	if (!istype(M))
-		user << "<span class='warning'>\The [src] cannot be applied to [M]!</span>"
+		to_chat(user, "<span class='warning'>\The [src] cannot be applied to [M]!</span>")
 		return 1
 
 	if ( ! (istype(user, /mob/living/carbon/human) || \
 			istype(user, /mob/living/silicon)) )
-		user << "<span class='warning'>You don't have the dexterity to do this!</span>"
+		to_chat(user, "<span class='warning'>You don't have the dexterity to do this!</span>")
 		return 1
 
 	if (istype(M, /mob/living/carbon/human))
@@ -28,24 +28,24 @@
 		var/obj/item/organ/external/affecting = H.get_organ(user.zone_sel.selecting)
 
 		if(!affecting)
-			user << "<span class='warning'>No body part there to work on!</span>"
+			to_chat(user, "<span class='warning'>No body part there to work on!</span>")
 			return 1
 
 		if(affecting.organ_tag == BP_HEAD)
 			if(H.head && istype(H.head,/obj/item/clothing/head/helmet/space))
-				user << "<span class='warning'>You can't apply [src] through [H.head]!</span>"
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.head]!</span>")
 				return 1
 		else
 			if(H.wear_suit && istype(H.wear_suit,/obj/item/clothing/suit/space))
-				user << "<span class='warning'>You can't apply [src] through [H.wear_suit]!</span>"
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.wear_suit]!</span>")
 				return 1
 
 		if(affecting.robotic == ORGAN_ROBOT)
-			user << "<span class='warning'>This isn't useful at all on a robotic limb.</span>"
+			to_chat(user, "<span class='warning'>This isn't useful at all on a robotic limb.</span>")
 			return 1
 
 		if(affecting.robotic >= ORGAN_LIFELIKE)
-			user << "<span class='warning'>You apply the [src], but it seems to have no effect...</span>"
+			to_chat(user, "<span class='warning'>You apply the [src], but it seems to have no effect...</span>")
 			use(1)
 			return 1
 
diff --git a/code/game/objects/items/stacks/nanopaste.dm b/code/game/objects/items/stacks/nanopaste.dm
index 7b156c025f..34ae9891ba 100644
--- a/code/game/objects/items/stacks/nanopaste.dm
+++ b/code/game/objects/items/stacks/nanopaste.dm
@@ -30,6 +30,19 @@
 		var/mob/living/carbon/human/H = M
 		var/obj/item/organ/external/S = H.get_organ(user.zone_sel.selecting)
 
+		if(!S)
+			to_chat(user, "<span class='warning'>No body part there to work on!</span>")
+			return 1
+
+		if(S.organ_tag == BP_HEAD)
+			if(H.head && istype(H.head,/obj/item/clothing/head/helmet/space))
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.head]!</span>")
+				return 1
+		else
+			if(H.wear_suit && istype(H.wear_suit,/obj/item/clothing/suit/space))
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.wear_suit]!</span>")
+				return 1
+
 		if (S && (S.robotic >= ORGAN_ROBOT))
 			if(!S.get_damage())
 				user << "<span class='notice'>Nothing to fix here.</span>"
diff --git a/code/game/objects/items/weapons/tools/weldingtool.dm b/code/game/objects/items/weapons/tools/weldingtool.dm
index 124526c29c..36392a2e69 100644
--- a/code/game/objects/items/weapons/tools/weldingtool.dm
+++ b/code/game/objects/items/weapons/tools/weldingtool.dm
@@ -67,6 +67,15 @@
 		if(!S || S.robotic < ORGAN_ROBOT || S.open == 3)
 			return ..()
 
+		if(S.organ_tag == BP_HEAD)
+			if(H.head && istype(H.head,/obj/item/clothing/head/helmet/space))
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.head]!</span>")
+				return 1
+		else
+			if(H.wear_suit && istype(H.wear_suit,/obj/item/clothing/suit/space))
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.wear_suit]!</span>")
+				return 1
+
 		if(!welding)
 			to_chat(user, "<span class='warning'>You'll need to turn [src] on to patch the damage on [H]'s [S.name]!</span>")
 			return 1
diff --git a/code/modules/power/cable.dm b/code/modules/power/cable.dm
index 4b8cb09a82..d3bffc0c92 100644
--- a/code/modules/power/cable.dm
+++ b/code/modules/power/cable.dm
@@ -555,6 +555,15 @@ obj/structure/cable/proc/cableColor(var/colorC)
 		if(!S || S.robotic < ORGAN_ROBOT || S.open == 3)
 			return ..()
 
+		if(S.organ_tag == BP_HEAD)
+			if(H.head && istype(H.head,/obj/item/clothing/head/helmet/space))
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.head]!</span>")
+				return 1
+		else
+			if(H.wear_suit && istype(H.wear_suit,/obj/item/clothing/suit/space))
+				to_chat(user, "<span class='warning'>You can't apply [src] through [H.wear_suit]!</span>")
+				return 1
+
 		var/use_amt = min(src.amount, CEILING(S.burn_dam/5, 1), 5)
 		if(can_use(use_amt))
 			if(S.robo_repair(5*use_amt, BURN, "some damaged wiring", src, user))