Installing quarter round in recessed area under cabinets
No need to rent a nail gun, compressor and purchase brad nails for this small job. Install the 1/4 round with a thin bead of construction adhesive only, a small amount of adhesive is needed. The amount of adhesive you apply will determine how the 1/4 round will sit against the base, so if the adhesive is apllied to heavy or thick when you press the 1/4 round into place the adhesive will squeeze out and make a mess. Run a continous bead of adhesive approx 1/8" thick along the bottom or floor side of the 1/4 round to avoid squeeze out, you can also go as far as to then spread the adhesive bead to the 1/4 round with a putty knife, wood shim or a scrap piece of wood. Use painters tape or another material that you can use to hold the 1/4 round in place until the adhesive sets up. There maybe a slight gap in some areas between the base and 1/4 round but even when 1/4 round is nailed it is not uncommon to have small gaps. Because your installing this under the cabinets it is some what hidden and not crutial to have a seamless install. Once installed and the adhesive is dry, fill the small gap between the 1/4 round and base with a paintable Dap caulking.