Finally!

src/main/java/modtweaker2/mods/tfcraft/handlers/Anvil.java

@@ -1,5 +1,6 @@
 package modtweaker2.mods.tfcraft.handlers;
 
+import static modtweaker2.helpers.StackHelper.areEqual;
 import static modtweaker2.helpers.InputHelper.toStack;
 import static com.bioxx.tfc.api.Crafting.AnvilReq.getReqFromInt;
 
@@ -66,7 +67,7 @@ public class Anvil {
 		public void apply() {
 			ArrayList<AnvilRecipe> toRemove = new ArrayList<AnvilRecipe>();
 			for (AnvilRecipe recipe : AnvilManager.getInstance().getRecipeList()){
-				if (recipe.getCraftingResult() != null && recipe.getCraftingResult() == stack){
+				if (recipe.getCraftingResult() != null && areEqual(recipe.getCraftingResult(), stack)){
 					toRemove.add(recipe);
 				}
 			}

src/main/java/modtweaker2/mods/tfcraft/handlers/Barrel.java

@@ -2,6 +2,7 @@ package modtweaker2.mods.tfcraft.handlers;
 
 import static modtweaker2.helpers.InputHelper.toFluid;
 import static modtweaker2.helpers.InputHelper.toStack;
+import static modtweaker2.helpers.StackHelper.areEqual;
 
 import java.util.ArrayList;
 
@@ -81,12 +82,12 @@ public class Barrel {
 		public void apply() {
 			ArrayList<BarrelRecipe> toRemove = new ArrayList<BarrelRecipe>();
 			for (BarrelRecipe recipe : BarrelManager.getInstance().getRecipes()){
-				if (recipe.getRecipeOutIS() != null && recipe.getRecipeOutIS() == stack){
+				if (recipe.getRecipeOutIS() != null && areEqual(recipe.getRecipeOutIS(), stack)){
 					toRemove.add(recipe);
 				}
 			}
 			for (BarrelRecipe recipe : BarrelManager.getInstance().getRecipes()){
-				if (recipe.getRecipeOutFluid() != null && recipe.getRecipeOutFluid() == fluid){
+				if (recipe.getRecipeOutFluid() != null && recipe.getRecipeOutFluid().isFluidEqual(fluid)){
 					toRemove.add(recipe);
 				}
 			}

src/main/java/modtweaker2/mods/tfcraft/handlers/Kiln.java

@@ -1,6 +1,7 @@
 package modtweaker2.mods.tfcraft.handlers;
 
 import static modtweaker2.helpers.InputHelper.toStack;
+import static modtweaker2.helpers.StackHelper.areEqual;
 
 import java.util.ArrayList;
 
@@ -19,11 +20,15 @@ import com.bioxx.tfc.api.Crafting.KilnRecipe;
 @ZenClass("mods.tfcraft.Kiln")
 public class Kiln {
 
+	/** Deprecated, since pottery kiln will check <code>x instanceof ItemPotteryBase</code>
+	 *  <p>If you have a such item, you might consider to use it
+	 */
+	@Deprecated
 	@ZenMethod
 	public static void add(IItemStack input, int lv, IItemStack output){
 		MineTweakerAPI.apply(new AddRecipe(new KilnRecipe(toStack(input), lv, toStack(output))));
 	}
-	
+
 	@ZenMethod
 	public static void remove(IItemStack stack){
 		MineTweakerAPI.apply(new RemoveRecipe(toStack(stack)));
@@ -44,7 +49,7 @@ public class Kiln {
 		public void apply() {
 			ArrayList<KilnRecipe> toRemove = new ArrayList<KilnRecipe>();
 			for (KilnRecipe recipe : KilnCraftingManager.getInstance().getRecipeList()){
-				if (recipe.getCraftingResult() != null && recipe.getCraftingResult() == stack){
+				if (recipe.getCraftingResult() != null && areEqual(recipe.getCraftingResult(), stack)){
 					toRemove.add(recipe);
 				}
 			}

src/main/java/modtweaker2/mods/tfcraft/handlers/Quern.java

@@ -1,6 +1,7 @@
 package modtweaker2.mods.tfcraft.handlers;
 
 import static modtweaker2.helpers.InputHelper.toStack;
+import static modtweaker2.helpers.StackHelper.areEqual;
 
 import java.util.ArrayList;
 
@@ -45,7 +46,7 @@ public class Quern {
 		public void apply() {
 			ArrayList<QuernRecipe> toRemove = new ArrayList<QuernRecipe>();
 			for (QuernRecipe recipe : QuernManager.getInstance().getRecipes()){
-				if (recipe.getResult() !=null && recipe.getResult() == stack){
+				if (recipe.getResult() !=null && areEqual(recipe.getResult(), stack)){
 					toRemove.add(recipe);
 				}
 			}