diff --git a/lib/dm-migrations/adapters/dm-do-adapter.rb b/lib/dm-migrations/adapters/dm-do-adapter.rb
index 56609ed..b731d2e 100644
--- a/lib/dm-migrations/adapters/dm-do-adapter.rb
+++ b/lib/dm-migrations/adapters/dm-do-adapter.rb
@@ -195,16 +195,17 @@ def create_unique_index_statements(model)
 
         # @api private
         def property_schema_hash(property)
-          primitive = property.primitive
-          type_map  = self.class.type_map
+          dump_class  = property.dump_class
+          type_map = self.class.type_map
+          schema   = type_map[property.class] || type_map[dump_class]
 
-          schema = (type_map[property.class] || type_map[primitive]).merge(:name => property.field)
+          schema.merge!(:name => property.field)
 
           schema_primitive = schema[:primitive]
 
-          if primitive == String && schema_primitive != 'TEXT' && schema_primitive != 'CLOB' && schema_primitive != 'NVARCHAR'
+          if dump_class.equal?(String) && schema_primitive != 'TEXT' && schema_primitive != 'CLOB' && schema_primitive != 'NVARCHAR'
             schema[:length] = property.length
-          elsif primitive == BigDecimal || primitive == Float
+          elsif dump_class.equal?(BigDecimal) || dump_class.equal?(Float)
             schema[:precision] = property.precision
             schema[:scale]     = property.scale
           end
diff --git a/lib/dm-migrations/adapters/dm-postgres-adapter.rb b/lib/dm-migrations/adapters/dm-postgres-adapter.rb
index f3a26e3..063d2d1 100644
--- a/lib/dm-migrations/adapters/dm-postgres-adapter.rb
+++ b/lib/dm-migrations/adapters/dm-postgres-adapter.rb
@@ -65,10 +65,8 @@ def without_notices
         def property_schema_hash(property)
           schema = super
 
-          primitive = property.primitive
-
           # Postgres does not support precision and scale for Float
-          if primitive == Float
+          if property.kind_of?(Property::Float)
             schema.delete(:precision)
             schema.delete(:scale)
           end
diff --git a/lib/dm-migrations/sql/table_creator.rb b/lib/dm-migrations/sql/table_creator.rb
index d354af9..2055148 100644
--- a/lib/dm-migrations/sql/table_creator.rb
+++ b/lib/dm-migrations/sql/table_creator.rb
@@ -83,7 +83,7 @@ def build_type(type_class)
           schema[:primitive] = type_class
         else
           type_map  = @adapter.class.type_map
-          primitive = type_class.respond_to?(:primitive) ? type_class.primitive : type_class
+          primitive = type_class.respond_to?(:dump_as) ? type_class.dump_as : type_class
           options   = (type_map[type_class] || type_map[primitive])
 
           schema.update(type_class.options) if type_class.respond_to?(:options)