Removing priority overlays, update_icon() splitup for guns.

code/game/objects/items/grenades/plastic.dm

@@ -60,7 +60,8 @@
 	if(target)
 		if(!QDELETED(target))
 			location = get_turf(target)
-			target.cut_overlay(plastic_overlay, TRUE)
+			target.cut_overlay(plastic_overlay)
+			UnregisterSignal(target, COMSIG_ATOM_UPDATE_OVERLAYS, .proc/add_plastic_overlay)
 			if(!ismob(target) || full_damage_on_mobs)
 				target.ex_act(EXPLODE_HEAVY, target)
 	else
@@ -126,13 +127,17 @@
 				I.embedding["embed_chance"] = 0
 				I.updateEmbedding()
 
-		target.add_overlay(plastic_overlay, TRUE)
+		RegisterSignal(target, COMSIG_ATOM_UPDATE_OVERLAYS, .proc/add_plastic_overlay)
+		target.update_icon()
 		if(!nadeassembly)
 			to_chat(user, "<span class='notice'>You plant the bomb. Timer counting down from [det_time].</span>")
 			addtimer(CALLBACK(src, .proc/prime), det_time*10)
 		else
 			qdel(src)	//How?
 
+/obj/item/grenade/plastic/proc/add_plastic_overlay(atom/source, list/overlay_list)
+	overlay_list += plastic_overlay
+
 /obj/item/grenade/plastic/proc/shout_syndicate_crap(mob/M)
 	if(!M)
 		return