It is not recommended to use interior paints outside, or exterior paints inside.
Interior paints do not have the extra chemicals in them to make the finish weather resistant, and durable enough for exterior use. They tend to fade, chalk, and deteriorate relatively quickly.
Yes You can. But First Sand Your Patio.
Before any interior painting
No and yes it depends
Interior paint is more porous and less resistant to the elements than a paint actually devised to use outside. A flat paint finish or a satin paint finish is better outside, a gloss paint finish can also be used but only sparingly, as it reflects light and may highlight more flaws.
Many hotels that use paint use satin or semi-gloss latex paint in their interior applications.
Very unlikely, although possible if it's a very matt wallpaper. You could try using a matt undercoat, then gloss on top.
Before any interior painting
No and yes it depends
Interior paint is more porous and less resistant to the elements than a paint actually devised to use outside. A flat paint finish or a satin paint finish is better outside, a gloss paint finish can also be used but only sparingly, as it reflects light and may highlight more flaws.
By using rubbing compound
Dark semi-gloss colours.
Many hotels that use paint use satin or semi-gloss latex paint in their interior applications.
Very unlikely, although possible if it's a very matt wallpaper. You could try using a matt undercoat, then gloss on top.
semi gloss
Using exterior paint on the interior should not be a problem. You would only use exterior paint outside because it weathers better, which is not really an issue here.
Sears Ultra Latex Interior Semi-Gloss Paint is a high quality paint for all interior surfaces, but is particularly useful on wood trim, or kitchen and bath areas where stain and milder resistance is important and you need a surface that is easy to wash without damaging the surface. It is guaranteed to cover in one coat and comes with a limited lifetime warranty.
At one time paint only came in a limited gloss range, flat, semi-gloss and high-gloss. The higher the gloss factor the harder the paint... the harder the paint the more washable it is. People used to only use high gloss or semi-gloss in kitchens and bathrooms so they could keep the rooms cleaner. These days, with the availability of a wider selection of gloss finishes and the tendency for people to paint more frequently, it is no long essential to use semi-gloss in your kitchen. I have been using a pearl luster paint successfully in kitchen for more than ten years with very good results.
Go over the door lightly with 100 grit sandpaper. Apply a coat of interior/exterior primer. Then you can apply any paint you desire.