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Question:

How to make paper mache look smooth?

How to make paper mache look smooth?

Answer:

Leave the vents openYour attic needs to breath so moisture won't build up and cause other problems Adding extra insulation in the attic is always a good ideaJust make sure you you keep all the vents open.
Do not cover the ventsThe temp in your attic should be the same as the outside tempHeating the attic space will melt any snow that might be on the room and cause ice damsThe best solution would be to add insulation being sure to keep the vents in the soffit clear to ensure proper ventilation in the attic.
Make another layer of paper mache slurry: Soak a roll of cheap toilet paper in a bowl of water/white glue mix (about 50/50)Once the TP falls apart, you can use it like a slurry - a paste that you can use to fill all the dimplesThe TP slurry should feel about the same consistency as pancake batter when the mixture is rightSpread the paste over the unit with your hands, shaping and smoothing as you goWhen it's dry, sand it again for smoothness.
The circulation will help eliminate moisture, which is the enemy of most building materialsJust be sure you have plenty of insulation!

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