Use good quality tape 3m 1 blue painter s tape.
Do you seal the baseboard near the floor.
If you happen to have thick 9 16 inch just over a half inch baseboards made of wood look for 7 16 inch baseboards made of polystyrene that hug the wall.
Caulking between the baseboard and floorboards will help solve gaps imperfections on the floor.
You can even use shorter baseboards such as 2 3 4 inch high that also conform slightly in a vertical direction to follow waves in the flooring.
It kind of depends on what flooring material you will be putting down.
It s amazing how nice it finishes the job off.
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For hardwood vinyl plank or sheet vinyl you could if you need to fill what might look like an unsightly gap.
You should get a new high quality painter come in and fix the bad prep work and repaint your baseboards but you will pay dearly for their time.
Flexible trim strips help keep a sanitary seal between baseboards and floors by greg amundson may 27 2020 tags.
My tips for caulking bottom of baseboards.
More importantly however they can interfere with the ability of the caulk to bind to the surfaces you do want it to stick to.
Seal narrow cracks with paintable or clear latex caulk either at the top or along the bottom where the baseboards meet the floor.
If your physically able to save money look at youtube videos on how to do paint prep buy a good detail sander with various grits of sand paper and.
Absolutely do not caulk between the floor and base.
According to structure tech people will bring up the argument that not caulking a toilet to the floor can help you identify a leak.
However if you re filling a gap you bette.
The gap between the wall and the floor that a baseboard typically covers can be as wide as an inch and there is often a direct path between the bottom of the wall plate and the crawl space.
Since one of the uses of baseboard caulking is to prevent water damage a tight seal is a must.
Use water or a household cleaner like formula 409 to give your floor baseboard and wall a thorough cleaning.
Gaps between baseboards and laminate floors are just unattractive and can affect your entire house cooling and heating system.
When setting the tape hold the roll flat up against the baseboard as a guide in positioning the tape first photo above.
But once you get the hang of it you ll fly right through.
Gaps on your floor are the last things you would wish to deal with especially if you have a heating system.