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If you sand plaster, there will be dust, that is unavoidable. If you don't want to inhale the dust, you can wear a face mask.
You don't have to remove old wallpaper to hang new wallpaper, however, depending on the quality of the new wallpaper it might look better if you do remove the old paper first.
ehm wet the plaster
form_title= Bathroom Wallpaper form_header= Add wallpaper to you home. What color wallpaper do you need?*= _ [50] What are the dimensions of your bathroom*= _ [50] Do you need to remove old wallpaper?*= () Yes () No
form_title= Brick Wallpaper form_header= Add depth to your home with brick wallpaper. Where are you installing the wallpaper?*= _ [50] How much wallpaper do you need?*= _ [50] Do you need to remove old wallpaper?*= () Yes () No
form_title= Butterfly Wallpaper form_header= Create a dream oasis with butterfly wallpaper. Where are you installing the wallpaper? *= _ [50] How much wallpaper do you need?*= _ [50] Do you need to remove old wallpaper*= () Yes () No
form_title= Beadboard Wallpaper form_header= Install new wallpaper in your home. What color wallpaper do you want to install?*= _ [50] Have you ever installed wallpaper?*= () Yes () No Do you need to remove old wallpaper?*= () Yes () No
Usually, there is drywall under the wallpaper. It is not difficult to remove the wallpaper (by steaming, or another method) to get to the basic drywall. Then, you can texture it and then paint it.
form_title= Purple Wallpaper form_header= Install purple wallpaper in your home. What are the dimensions of the room?*= _ [50] Do you need to remove old wallpaper?*= () Yes () No Do you need someone to install the wallpaper?*= () Yes () No
form_title= Designer Wallpaper form_header= Install designer wallpaper in your home. What designers are you most interested in?*= _ [50] What color wallpaper do you want?*= _ [50] Do you need to remove old wallpaper?*= () Yes () No
form_title= Paintable Wallpaper form_header= Add your personal style to your home. What rooms will you be installing the wallpaper?*= _ [50] Do you need to remove old wallpaper?*= () Yes () No What color would you like the wallpaper?*= _ [50]
form_title= Damask Wallpaper form_header= Install new wallpaper in your home. What color paper do you need?*= _ [50] Do you need to remove old wallpaper?*= () Yes () No Do you want vinyl Damask wallpaper?*= () Yes () No