Painting directly over that will expose the taping and screws in the wall. The surface is left free of excess joint compound.
Drywall finishing levels.
Painting level 2 drywall. Level 5 drywall finishing includes all measures included in level 4 but with another. Joint compound is applied over all fastener heads and beads. If the final decoration is to be a flat paint light texture or lightweight wall covering a level 4 finish is recommended.
Ridges and tool marks are acceptable for a level 2 finish. Level 5 is used for semi gloss gloss enamel and non textured flat paint finishes or in areas exposed to abundant sunlight. Drywall hung only no tape or finish this is comparable to level 0 drywall hung fire taped only this is comparable to level 1 drywall hung taped heavy texture ready for paint this is comparable to level 2 drywall hung taped ready for texture this is comparable to level 3 drywall hung.
However the taping is more detailed and more extensive. This next level means that you have skimmed a thin coat of joint compound over the tape and covered. Level 2 unfinished as in level 1 there is taping but no painting.
Now the painting contractor will scuff sand the wall to clear away the fuzzy raised fibers from the drywall paper and apply the intermediate coat generally a low sheen eggshell or pearl finish corresponding to an mpi gloss level 2 or 3. This level means that drywall joint tape has been embedded in joint compound but nothing further has been done. At this level again all drywall joints and interior angles are taped and at this level the tape is embedded in the compound as opposed to merely being set and wiped with a joint knife to leave a thin coat of.
Primer is a must. Level 2 finish is the recommended in garages warehouse storage areas and other similar areas where the final surface appearance is not of concern. As stated in level 4 all joints and interior angles shall have tape embedded in joint compound and shall be immediately wiped with a joint knife leaving a thin coating of joint compound over all joints and interior angles.
What is a level 2 drywall finish in a level 2 drywall finish you are covering over the joints and angles but not concealing them in the same way that you would a level five. It s the ultimate in drywall finishing. At a level 5 finish the drywall has a smooth uniform surface that looks great under any intense lighting harsh shadows or high gloss paint and your fasteners have essentially no chance of showing through the paint.
You can not only cover over the joints as in level 1 but should also put the joint compound over anything sticking out from the wall such as the fastener heads. Level 2 drywall finish often serves when a water resistant board is used as a tile substrate. The painting contractor then spot primes by rolling more latex drywall sealer onto the newly repaired areas.
Level 0 implies that no finishing of any type has been done at this level drywall is simply fastened to the walls or ceiling. As mentioned the drywall in your garage likely has a level 2 finish. Just like level 2 finishes level 3 includes having the tape embedded in joint compound and wiped to leave a thin coat over the interior angles and joints.