Plaster Repair using Big Wally's Plaster Magic

[dancerbabe1978]

Best video I've seen on the subject. It actually shows what is happening behind the wall.

[excelsiorfarms]

I bought a kit... it is OVER THE TOP expense wise. Didn't get 1/10 of my job done for the $90.00 I spent. The drill systems works well, then vacuum, you can squirt in some plaster bonder if you want; then some building adhesive; yes PVAs ("polyvinyl acetates" for ignorant fools like myself) are good because it does create an extreme mess (especially ceilings) and they are water soluble.

Just don't work in too large an area; the adhesive sets up prior to your getting the tabs snug.

[sfdesignjunkie]

Regarding PVA's, the fact is, both of you are right (BigWalleze & terry4144). Simple science; diluition = better penetration BUT poorer adhesion. Period.

No one has mentioned the EPA Lead Paint requirements & 6 sq ft limit (then pending), and unless the job is tiny, or you own AND occupy the dwelling, you need to be certified to do any work.

Simple math: less debris = less waste. Less disturbance = less lead paint dust. It takes a lot of 3/16" holes to make 6 sq ft.

It's a clever idea.

[BigWalleze]

This adhesive has no relationship to PVA's, its like comparing apples to oranges. Big Wallys Plaster Magic works for lime or gypsum plaster by reattaching it to its lath. PVA is a film-type bonding agent that adheres to the plasters surface only; diluted or not, PVAs will not to penetrate the plaster. Big Wallys Plaster Magic deals with the issue effectively by penetrating the surface and consolidating the plaster, thus resulting in a superior long-lasting bond.

[catrinlewis]

Query-- Where does this vid say anything about PVAs? Why even bring them up and confuse the issue? Terry4144, are you saying that one could use dilute PVA for such repairs and do without the Plaster Magic system altogether?

[terry4144]

I was backing up someone elses comment that you could use pva to seal it then use a panel adhesive it was BigWalleze that said you can't but of course he would say that wouldnt he then we got into a debate about pva being used as a sealer

[terry4144]

This would not work in the UK as plaster that has become detached from laths would be a lime plaster that would crumble when drilled, you would end up with more loose plaster and would end up having to remove even more

[BigWalleze]

@terry4144 This material was designed for lime/sand/hair plaster which was used in the United States from the 17th century through the early 20th century. I have personally drilled miles of holes and repaired thousands of square feet of lime plaster on wood lath and brick.  After all our plaster history and techniques came from the UK

[hackmidbillabong]

diluted pva and grip fill wot a con

[BigWalleze]

@hackmidbillabong This material is not a poly vinyl acetate. PVAs are film type adhesives. The reason that this material works so well is that is a penetrating adhesive resulting in a stronger bond in an extremely difficult environment. TOH people believe it is a credible product.

[terry4144]

diluted PVA penetrates thats why its used as a sealer

[BigWalleze]

@terry4144 As soon as you dilute a PVA its warranty is void. When working professionally or as a DIYer using a material for what it is designed is always a prudent step. PVAs are not designed to penetrate therefor using a dilute PVA as a penetrating material will meet with no success.

[terry4144]

It would be quicker and better to replace it

[BigWalleze]

@terry4144 a a matter of FACT it is easier and quicker and less expensive to repair old plaster than replace it. NOT to mention that it doesnt contribute more material to our land fills in the form of plaster debris.

[terry4144]

I'm sorry but you are very wrong PVA is water based thats why you can dilute it if used neat it will form a skin and be easily peeled off

[BigWalleze]

@terry4144 I majored in organic chemistry. I not only have worked in the plastering trade and the preservation field for thirty years but I know my adhesives. PVAs are designed to re-emulsify upon contact with a wet basecoat conforming to the profile of the aggregate in the plaster. They need the film characteristics in order to perform as designed.

[terry4144]

I also have been plastering 30 years and use PVA on a regular basis if PVA is used neat on a porous surface the plaster could be easily detached its the same with any emulsion if applied neat it can skin off ,your PVA must be different where you are as the directions on every can tell you to thin it 5 to 1