tag:blogger.com,1999:blog-11904671.post4718074540635775565..comments2023-08-25T03:21:41.842-07:00Comments on The Petch House: Finally, Plaster.Greghttp://www.blogger.com/profile/02807710209656158413noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-11904671.post-40384392018596187962007-05-15T17:53:00.000-07:002007-05-15T17:53:00.000-07:00OOOOPS, fogot to answer one of your comments. you ...OOOOPS, fogot to answer one of your comments. <BR/><BR/>you said:<BR/><I>"I speculated at one time that maybe the long cure times you hear about for lime was due to the old paint formulas and not the plaster. The plaster would absorb the linseed oil as it cured and so you would be left with a mottled finish. This does not seem to be the same for modern paints."</I><BR/><BR/>The "modern" paints you are talking about are latexes. Latex can deal with a higher alkalinity. There is one that has been promoted as dealing with a pH of 13 (talk about your "marketing" <ROFLMAO>)<BR/><BR/>As I said before, oil paints saponify (hydrolyze with alkali to form a soap and glycerol) with high pH.<BR/><BR/>-B.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11904671.post-5659481729836042932007-05-15T17:44:00.000-07:002007-05-15T17:44:00.000-07:00Thanks Bill,Yes, the whole plaster discussion was ...Thanks Bill,<BR/><BR/>Yes, the whole plaster discussion was very helpful to me as well. Just five years ago when I first started working on my house I found almost no information about plaster. It was very frustrating. Slowly, different people got help from old-timers and learned things through experimenting. Over at the http://oldhouseweb.com discussion forum there is a new Reference section with some good posts on lime plaster.Greghttps://www.blogger.com/profile/02807710209656158413noreply@blogger.comtag:blogger.com,1999:blog-11904671.post-13589011203985209432007-05-15T17:35:00.000-07:002007-05-15T17:35:00.000-07:00Greg,gotta say I spoke too soon. I had just droppe...Greg,<BR/><BR/>gotta say I spoke too soon. I had just dropped by your Blog and had not fully read everything on the plaster subject. I now see that many others, (especially Roger from Spring City PA) have helped you with a LOT of facts. They have helped me also.<BR/><BR/>I gotta thank you for this all. The discussions have been great.<BR/><BR/>As to lime being "more forgiving" than gypsum. From my limited experience, yes and no. That's why we get to MIX them. Best of BOTH worlds <G> I was determined to be a purist and make my repairs with lime, but then realized gypsum is just as authentic. <BR/><BR/>I'm a wallcovering installer by trade and in the past a painter. The alkalinity of lime can raise hell with wallpaper (brown "burn-outs"), and also oil based paint (saponification). Gypsum is not as alkaline and does cure faster. BUT lime is easier to work due to it's slower set time. Both have their strong points.<BR/><BR/>You doing good with this blog !!<BR/><BR/>-BillAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11904671.post-82496497201486544652007-05-15T10:49:00.000-07:002007-05-15T10:49:00.000-07:00Bill,I don’t always let facts get in the way when ...Bill,<BR/><BR/>I don’t always let facts get in the way when I’m writing. I still think that lime is a more forgiving plaster in the long run, and therefor may be considered better by some. Also, it is superior for wet areas. <BR/><BR/>As for the cure time, a fellow old house restorer has done traditional lime plaster and painted within a month of the completion. I speculated at one time that maybe the long cure times you hear about for lime was due to the old paint formulas and not the plaster. The plaster would absorb the linseed oil as it cured and so you would be left with a mottled finish. This does not seem to be the same for modern paints.<BR/><BR/>And don’t kid yourself, marketing plays a role in everything in our society, and has for a long time.Greghttps://www.blogger.com/profile/02807710209656158413noreply@blogger.comtag:blogger.com,1999:blog-11904671.post-90808321880641849832007-05-15T07:00:00.000-07:002007-05-15T07:00:00.000-07:00You mention Gypsum replacing Lime due to marketing...You mention Gypsum replacing Lime due to marketing. Sorry, that's wrong. Pure lime plaster will take months and even up to a year to cure properly before paint and other decorative finishes can be applied. Gypsum takes much shorter time. But that's just a partial reason. A great book all you should read is "Plastering Skills" by F. Van Den Branden & Thos L. Hartsell. It even tells you about the Lightweight aggregates again, NOT a marketing ploy. Lightweight aggregates sych as vermiculite, perlite, and pumice increase insulation & sound absorbtion, increase fire protection, and are lighter than sand. <BR/>BTW, I'm not by ANY means an experienced expert. I've been yearning to learn more about the craft of plastering for years, that book really helps, as do experiences such as yours, thanks.<BR/>-BillAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11904671.post-83343133370917158672007-04-21T19:52:00.000-07:002007-04-21T19:52:00.000-07:00I thought about this and it's no problem. Just wai...I thought about this and it's no problem. Just wait until Easter and it's sure to come on TV. Don't have a TV, then hang out at the mall. It's bound to be on a TV in a store showroom someplace. It would be hard to live in North America, or be a Christian without seeing that movie at some point. For non-Christians living outside North America, I'm sorry, this is the best I can do.Greghttps://www.blogger.com/profile/02807710209656158413noreply@blogger.comtag:blogger.com,1999:blog-11904671.post-56155518618717133772007-04-21T18:57:00.000-07:002007-04-21T18:57:00.000-07:00Ummmmmmmm what if you're to young to have watched ...Ummmmmmmm what if you're to young to have watched the Ten Commandments? I'm not saying I haven't watched it. (Because I have thank you very much 12 years of parochial schools!) But ya know......... (Sorry it's the smart alec in me.)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11904671.post-14897826019989785302007-04-21T11:04:00.000-07:002007-04-21T11:04:00.000-07:00I forgot to take pictures yesterday before I left ...I forgot to take pictures yesterday before I left the room. Once out and cleaned up, I didn't want to go back in. The floor gets a lot of dry plaster and the occasional drop of wet plaster. I don't want to track through the house. I'll gets some shots today of the scratch coat before I start the brown coat.Greghttps://www.blogger.com/profile/02807710209656158413noreply@blogger.comtag:blogger.com,1999:blog-11904671.post-89788346773606504422007-04-21T10:39:00.000-07:002007-04-21T10:39:00.000-07:00Great analogy! Are you taking pictures? If so I wo...Great analogy! Are you taking pictures? If so I would love to see them! We love our plaster walls but now have quite a few places with drywall. We tried to find a plasterer to do a ceiling that had had furring strips nailed into it when the PO installed acoustic ceiling tile (that looked lovely) but ended up installing drywall over it.Anonymousnoreply@blogger.com