DanG wrote:


If you get a bubble, it means that the paper tape is not stuck to the
drywall face paper. No amount of sanding can fix it, you will just tear
it
up. When you see the bubble(s) cut them open with a utility knife. Use
wetter rather than dryer taping mud. Force the mud into the cut, you need
a
full wet coat under the tape. You may need to open some of the joint up
to win.

You will get the same bubbles when you apply the top coat of taping mud.
This is when to watch for them, find then, and fix them. Really miserable
to find them under coat 1 or 2 of paint.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing. . . .
DanG


"Brendan" wrote in message
om...
Hi,

I just had some work done in my kitchen which included some wall
repair. The contractors fixed the drywall and laid a couple of coats
of mud (the contractors are gone and are not returning). I put on
what I hoped was a final coat of mud and sanded. I didn't notice any
bubbles at this time. I then put on a water-based primer and I saw
some bubbles arise. I realize this is bad, so I sanded down as much
of the mud as I could (the paper started to shred). The tape appears
flat, but I can press in some of the paper in areas of the repaired
wall joints. From some posts I have read in this group, I guess the
water in the primer soaked into the tape and caused the bubbles. So
what do I need to do? I think if I continue sanding I will start to
rip the paper. Can I use an oil-based primer to lock down the paper
and tape? Then lay some more mud, sand and prime (oil-based this
time!)? Will this work? Any advice would be appreciated.

thanks,

Brendan


I'd go with Brendan. When the mud and tape was installed there was not
enough mud to bond the tape. The tape has tiny hole in it that when pressed
against the mud on the joint will ooze out joint compound insuring a good
bond then when you apply the second coat it gets knocked down and becomes
smooth. The best thing is to open the tape at the bubble with a sharp
utility knife and get mud behind the tape. Then once dried apply another
coat of joint compound over the fix and feather it in. This should fix your
problem.

Rich
--
"You can lead them to LINUX
but you can't make them THINK"