Brushing is a time tested technique and many high quality brushes are available.
Can i use a roller to varnish floor.
Yes you can use a roller to apply polyurethane finish on a floor and other wooden surfaces.
There are three choices for applying polyurethane properly to a hardwood floor.
Polyurethane tends to dry faster and you can use a paint roller or a brush for application.
The final appearance may not be as good as if the whole floor were stripped sanded and completely re varnished any damage to the original surface may remain visible.
For the areas around the edge of the floor where it meets the walls use a soft bristled paintbrush.
You can but wash and dry it before you use it this works better use the above for waterborne poly and oij based poly cutting in at the ends and around trim use the above 18 inch lambskin for oil based or with 18 inch foam pad for waterborne poly i.
It also helps to minimize the chances of over application of the finish.
To do the bulk of the floor you can either use a roller with short fibers or a roller made from a material known as lambswool.
Although they are costly the best brushes for the task are those made using china bristles or natural hairs.
By brush with a roller and pad or by spraying.