求翻译：最好是去正规的大型超市、建材城、专卖店购买，都是省时省力的选择，通常这些地方的产品和品牌种类齐全，质量有保证。切不可为了省钱去贸然选择便宜产品，如果不能保证涂料质量，刷墙进行时和刷后将来时都会出现很多问题，若是返工，那就更不划算了。是什么意思？

Preferably a formal building materials supermarkets, city, store purchases, selection of all save time and effort, usually of the local brand and an extensive range of products, quality is guaranteed. Not to save money to hesitate to choose cheaper products, if you cannot guarantee the quality of paint, brush and brush the wall will appear in the future after a lot of problems if reworked, it's even not cost-effective.