Will the new paint lift off if the old paint is still flaking. Could you seal the old paint? Or does that just seal the paint and does not adhear it to the driveway
Pressure wash the driveway first. The old paint will continue to peal away taking the new paint with it. You need to get a good adhesion or just keep pealing. The other thing you can do is to scrub the driveway down with a Muratec acid solution. This will remove the pealing paint as well as most anything else on your driveway. Make sure you follow directions and wear proper chemical resistant gloves and eye protection. rinse and let dry thoroughly before you try to repaint.
There are several reasons this might happen. When you stripped the wallpaper if you did not get all the paste off it would react with the paint. Although this usually happens while the paint is still wet some old pastes don't react as quickly. I always use an oil based primer after stripping paper. Paste will not react to an oil based primer and will create a better bond. Moisture is also a common cause for peeling or flaking paint. If the area is small you should scrape it down and skim it with joint compound. It may require 2 coats. Sand, prime with Cover Stain and repaint.
If you paint over flaking paint, then you do not get good paint adhesion to the surface you are painting. Therefore, your new paint job will flake just like the old paint job. You need to remove all of the flaking paint and then prime the surface in order to prepare it to accept the new paint. Either borrow or rent a high power pressure washer. This will certainly lift and wash away any old paint that is not securely attached to the driveway. Use a good cement primer. Ask your local paint store or a swimming pool company for the correct primer and paint to use on cement. With all due respect to home improvement store employees, they are not always trained to recommend the right product, I have learned. With painting anything, the prep work dictates the success of the job along with using the correct products for the job. It is the same amount of labor to use bad paint as it is to use good paint, so do it right from the start. Allow your driveway to completely dry and paint on a clear day and, if possible, try to avoid painting in direct sunlight. Good luck to you.
