Place newspaper, a tarpaulin, or a drop cloth on the floor below your project. Ventilate the area by opening all windows, and turning on a fan if possible. If there are other objects close by that you cannot move out of the way, also cover these with a drop cloth to protect them Attach 150 grit sandpaper to the sander, and sand every area that you are planning to paint. Pay special attention to the edges and any detailing. Apply the deglosser with a paintbrush, and leave it to soak into the wood for 15 minutes. Then wipe it off with a cloth.  Make sure that you are working in a well-ventilated area. Liquid deglosser takes the shine off surfaces and makes them dull to prepare for painting. Clean away all loose wood, coating, and dust particles from your project. Check all of the joints and corners to make sure that you haven't missed a spot. If there is a big mess, you can always vacuum or sweep away the dust first before using a tack cloth. Dilute 4 ounces (110 g) of TSP powder into 2 gallons (7.6 L) of warm water. Use a sponge to wipe down all surfaces with the solution. Then use a clean rag to rinse all of the surfaces with fresh, clean water. Always wear gloves when using TSP to avoid irritating your skin.
جهز منطقة العمل قبل البدء. استخدم ماكينة الصنفرة لصنفرة الأسطح برفق. استخدم سائل الصنفرة كبديل سريع لعملية الصنفرة. امسح كل غبار الصنفرة بقطعة شاش. نظّف كل الأسطح باستخدام منظف فوسفات ثلاثي الصوديوم.