Help! Front Doors Keep Blistering

Were these doors originally painted a different color, or stained and sealed?

Were they painted in high temps or high humidity?

Perhaps the Bondo affected the way in which the paint adhered. It's difficult to see accurately on my monitor, but there appears to be visible brush marks beneath the paint. Is it possible that inadequate time was allowed between priming and painting? The blistering makes me suspect that heat or humidity played a factor, here.

Wow. But , why did you paint OAK ? It could have been refinished to be spectacular !

What brand and type of paint was used?

Sounds like a moisture problem. Or he needs to use a stain hiding, bonding primer, sand lightly do another coat of primer, and sand again. Make sure the primer is completely dry then repaint.

I'm not sure why this has happened, but I know that they sell specialty paint for front doors at harddware stores and also craft stores. The paint is thicker and resists fading from the son. Unfortunately, I would have the door sanded again and painted with something new. You can always take a picture of your door to a paint or hardware store and see what they recommend.

Check to be certain he hasn't mixed oil paint and latex paint on the various layers. You can paint oil over latex but not latex over oil. Underlying moisture, too high of heat, etc. Read through these and check the painter's work

https://www.bobvila.com/articles/bubbling-paint/#:~:text=Avoid%20applying%20oil%2Dbased%20paint,in%20the%20oil%2Dbased%20coat.

https://www.thisoldhouse.com/painting/21142799/6-common-paint-problems-how-to-fix-them

https://www.sherwin-williams.com/homeowners/how-to/problem-solver/peeling-cracking/SW-ARTICLE-DIR-BLISTERING

http://www.housepaintingguide.org/why-paint-blisters-and-what-to-do-about-it/

here is some info that may help you out

https://www.benjaminmoore.com/en-us/contractors/job-solutions/troubleshooting/paint-blistering

https://pallaspainting.com/2018/03/26/blistering-paint-causes-and-solutions/

Thanks for all your replies. The paint used was Dunn Edwards Aristoshield Water Based Urethane Alkyd, Semi Gloss. The primer was Kilz (I don't know what kind). This last time, after sanding off the paint from 3 weeks ago, the painter sanded, then sprayed primer then used a large fan to dry it. Then he sanded and primed then sanded again. This would repeat over a time span of 2-3 hours. The doors were never brushed. The "brush marks" you may be seeing is the surface of the oak wood that they can't seem to get smooth. We live in a dry climate. The job was finished at 1:00pm. The bottom of the doors get direct sun starting at 4:30pm then moves up until sunset. It was around 86 degrees that day with low humidity. The air temperature in the entryway as the sun sets is around 100 degrees.

This might help you with some ideas on what is happening: https://www.youtube.com/watch?v=D5C-7QAaeRs

is it exposed to extreme heat or sun ? I think you need to look for a different paint. Would seek help with local paint store

My first thought was high heat from western sun or improperly prepared door.

I think it’s the bondo that’s doing it he should have used wood fill then sanded it down

Bondo is for vehicles all I ever heard. Not sure why he would use thsf

strip it then try painting again

The painter and Dunn Edwards rep will be here today to discuss the door.