Patching and Plastering - Primer old plaster before patching?
Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.View Full Version : Primer old plaster before patching?
foothill
06-04-09, 07:21 PM
Its been recommended to me that I prime my old paster with a shellac-based or alkyd primer prior to patching with setting compound. Is this extra step and expense necessary?
GBR in WA
06-04-09, 07:43 PM
Yes. Read this page and then click on "cracks" on the left boxes:
Getting Your Plaster Surface Ready For Repair (http://www.plaster-wall-ceiling-solutions.com/plaster-surface.html)
Be safe, G
Getting Your Plaster Surface Ready For Repair (http://www.plaster-wall-ceiling-solutions.com/plaster-surface.html)
Be safe, G
foothill
06-04-09, 09:31 PM
The webpage reads, "...you may choose to brush on a coat of fast drying oil-based primer/stainkiller for extra security." So it is a judgment call I take it.
marksr
06-05-09, 04:54 AM
What shape is the plaster in?
If there is any chalk/dust that can't be completely removed - use primer.
If there is any chalk/dust that can't be completely removed - use primer.
foothill
06-05-09, 09:16 AM
marksr:
Thanks for the reply. The old plaster is tight and clean. The situation is that I'm removing 5/16" laminate wall panels and then scraping away the backer glue cauing me to lose chunks of plaster.
I think I'll continue to scrape away any loose stuff, dust with a whisk broom, mist the old plaster with water and then apply the new stuff. On any deep areas I'm embedding mesh tape.
Thanks for the reply. The old plaster is tight and clean. The situation is that I'm removing 5/16" laminate wall panels and then scraping away the backer glue cauing me to lose chunks of plaster.
I think I'll continue to scrape away any loose stuff, dust with a whisk broom, mist the old plaster with water and then apply the new stuff. On any deep areas I'm embedding mesh tape.
coops28
06-05-09, 02:35 PM
There is a product called plaster weld. You can get it at sherwin williams. You put it on the sandy areas of plaster and it makes it hard as a rock.
foothill
06-05-09, 04:19 PM
Thanks for the responses. I couldn't find plaster weld so I did picked up a 13 oz. spray can of shellac-based primer made by Zinnser at Home Depot. I'll spot prime any areas that are especially sandy and approach it that way.