I’m having plaster mudding done tomorrow over blueboard. As a general rule, how long do I need to wait before I can prime? FYI – we are averaging about 80 degree days with 50% humidity.
Does anyone have any special tips, such as does new plaster require alkyd primer?
For those who follow these forums, I’m the idiot that put PVA primer on over new plaster. Luckily no disasters, but I don’t recommend it.
Thanks!
Replies
My plasters told me 10 to 14 days to cure. That is with rock lath and whatever plaster they were using. I used Fresh Start primer, except on the walls with really dark colors, or crayons. There were used white pigmented shellac as the first primer, then fresh start, then the final color.
For those who follow these forums, I'm the idiot that put PVA primer on over new plaster. Luckily no disasters, but I don't recommend it.
I follow this forum, but I don't recall the deed to which you're confessing. But what I'd really like to know is why don't you recommend it? I've used PVA primers on fully cured plaster without any problem. Specifically Muralo 563 general purpose primer.
-Don
Edited 7/6/2005 7:19 pm ET by Don D
"I follow this forum, but I don't recall the deed to which you're confessing. But what I'd really like to know is why don't you recommend it?"
See discussion 49808. Don't know why it's a bad idea, given your experience.
See discussion 49808. Don't know why it's a bad idea, given your experience.
Thanks for the reference. I should point out that whenever I've used PVA primer on plaster not only has it been fully cured, but it has always been OLD plaster. That's "old" as in usually decades, so I guess the stuff I've been priming should be pretty well cured by now.
I didn't know that newer plaster should be primed with an alkyd primer, so thanks for that info.
-Don
I would think alkyd primer is a bad idea. Since the plaster is alkaline and primer is oil based, if you use that primer on the plaster it would saponify, reducing its adhesion.
An acrylic latex primer should be good. But, in any case, read the can. The primer must be alkalai resistant, and those that are would have instructions on how and when to use them on new plaster.
Sherwin Williams makes a primer in the Preprite line made for this , have used it many times with great results
Give it a few days to dry out, it sets up chemically. You don't need a primer with everything except flat. The first coat primes, the second coat finishes. Too many coats equals a big film build up on the walls. Before you start painting, knock all the snots (Plaster) blobs off all electrical boxes and go over wall and fill any holes, etc. with joint compound. Do all your chalking and prep before a drop of paint hits the wall.
Good Luck, Jim Z
if I want drywall compound on my walls, I will call the sheetrock finishers. When people pay for a good plaster job, there is no reason to ruin it with drywall compound.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Show me a flawlless skimcoat job. I have been hanging paper for 20 years now and have NEVER seen one yet!
I've had guys who can leave it polished like a sheet of glass.but they generally don't seem to think it is important to be perfect for under paper.What I am getting at is that drywall compound does not adhere well all the time to plaster. If I use it to patch and skim an old plaster wall I always use a bonding agent first to ensure a smooth and longterm bond. I'm wiolling to bet that if you are skimming pockets with mud over the plaster, there are some places where your paper is holding the patch in place.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
I know what you are talking about when you say as smooth as glass. I had a guy that did my 1st house that was a crackerjack, every room was like a pearl. Some of these guys are not worth a wooden nickel. To get back to the thread, the joint compound is followed by a coat of primer for wallcovering and I have never had a call back for and wall defects using this method. in my area (southern Mass) it is always blueboard and the skim coat.
there are guys who say it can be done in a couple of days. I see it taking seven to ten days and sometimes two or three weeks, depending on weather. Heat is good, humidity not so. I have seen plaster jobs painted tooo soon that did nasty things. At least the new veneer plaster cures up quickly. The old three step on lathe required at least thirty days minimum.
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!