Article: If it is too cold or too humid, the paint won't dry or cure properly. This can result in the surface turning tacky. Ideally, the humidity should be 60% or lower. The temperature should be between 65 to 90 °F (18 to 32 °C). Check your local weather forecast to find out the humidity. If it is too humid, it would be best to save the project for another day when it is less humid. If you are working on larger project that can't fit on a table, cover the ground with a drop cloth or a cheap, plastic tablecloth, and set the object on top. This is especially necessary if you are painting a boat, sink, or door. Place all of the removed hardware into a box that you don't lose any pieces. It would be an even better idea to store small screws in a plastic bag inside the box.  Don't mask off the hardware. This won't give you a nice finish and could lead to the paint cracking or flaking. If the item has caulking, strip the caulking away. You will need to apply fresh caulking after the paint has cured. If the object is small enough to fit in a sink, take it inside and wash it with soap and water. Rinse it clean, then allow it to air dry completely. If you are working on a larger object, work in a bathtub instead. For especially large objects, such as tubs and boats, scrub it outside with soapy water, then rinse it with fresh water. Paint doesn't stick to glossy surfaces, so you need to remove all traces of shine to help it adhere. Sand the fiberglass with 150-grit sandpaper until it is no longer shiny, then work your way up to 400-grit sand paper. You want the surface to feel smooth and dull. A tack cloth is a tacky piece of fabric that picks up dust easily. You can find it in most hardware stores and well-stocked craft stores. If you can't find one, you can try a microfiber cloth instead. For stubborn sanding dust, use a rag dipped in mineral spirits. You can paint the entire fiberglass object, or you can paint only parts of it (i.e. stripes, zigzags, geometric shapes, etc.). Tear off strips of painter's tape, and use them to cover the areas that you do not want to be painted. Run your fingernail across the edges of the tape to ensure a tight seal. If there are any gaps, the paint may seep underneath and give you a fuzzy line.
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Make sure that it is not too cold or humid. Find a well-ventilated area to work in, then cover it with newspaper. Remove any hardware. Clean the object with soap and water. Buff away the shine with 150- to 400-grit sandpaper. Wipe the dust off with a tack cloth. Mask any areas that you don't want to be painted with painter's tape.