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A very common way to paint aluminium is with powder coating; it is sprayed onto the metal when it is very hot, where the powder melts and creates a secure bond that will last for many years. If you aren’t happy with a particular powder coating job or you would like to change the colour, it can be quite simple to return your aluminium to its original state.
Step 1: Set up a work area outside or in a garage (or large room that can be ventilated by opening doors and windows). Hang the aluminium object up via hooks so that you can easily access it all the way round.
Step 2: For areas of the powder coat that you do not wish to remove, cover them with some paper bags. Make sure that you tape the bags down, along all the ledges, with masking tape to fully protect the area.
Step 3: Spray the sections of the aluminium that you want to remove the powder coat from with an industrial strength gasket remover. Leave the object to sit for 15 to 20 minutes; you should notice the coating start to bubble and peel.
Step 4: Use a dry rag to wipe over the aluminium and remove the peeling powder coat. If you notice remaining spots of the coating, give them a spray with the gasket remover and leave to sit again.
You should be able to pick up some gasket remover at an automotive store in your area; just make sure that you wear heavy, long-sleeved clothing, gloves, safety goggles and a respiratory mask when working with it. You should also throw away the rags used to clean down the aluminium, as the remover is actually quite poisonous.