To provide a more understandable explanation, the main difference between interior and exterior walls lies in their application to indoor and outdoor environments.

外墙建筑装饰产品对耐候性都有一定的要求，这里的耐候性就是气候变化（风吹、日晒、雨淋），基于这个要求产品的强度上就一定要有保证。所以外墙腻子至少要有耐水的要求，多数会用水泥作为胶凝材料。

Exterior wall building decoration products have certain requirements for weather resistance, which refers to climate change (wind, sun, rain). Based on this requirement, the strength of the product must be guaranteed. So exterior wall putty must at least have water resistance requirements, and most will use cement as the bonding material.

内墙产品对于耐候性没有硬性要求，所以就会有普通腻子的应用，当然也就有耐水腻子。这就是为什么会出现普通腻子和耐水腻子的区别。

Interior wall products do not have strict requirements for weather resistance, so there will be the application of ordinary putty, and of course, there will also be water resistant putty. This is why there is a difference between ordinary putty and water resistant putty.

还有内墙产品因为要在室内应用一般对环保要求较高，当然这里不是说外墙就不环保，这是相对的。毕竟在室内应用的环境存在一个密闭使用的过程，所以对物质释放是有要求。5.外墙腻子可以当内墙用，但是内墙腻子是一定不能到外墙用的。这里更主要的区别就是对耐候性的要求。外墙要高于内墙。6.如果对普通腻子和耐水腻子还有疑问可以参考我的历史回答。

There are also interior wall products that generally have high environmental requirements for indoor applications. Of course, this does not mean that exterior walls are not environmentally friendly, which is relative. After all, there is a closed use process in indoor applications, so there are requirements for substance release. 5. Exterior wall putty can be used as an interior wall, but interior wall putty must not be used on the exterior wall. The main difference here is the requirement for weather resistance. The outer wall should be higher than the inner wall. If you have any questions about ordinary putty and water resistant putty, please refer to my historical answer.

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