Emulsion over silicon mastic probs

[jamiller]

Is there a trick that allows emulsion to cover silicone (around a window frame for example). This must be a common prob. Thanks in advance.

 

[confidentincompetent]

Is there a trick that allows emulsion to cover silicone (around a window frame for example). This must be a common prob. Thanks in advance.

I touch prime round the silicone with a solvent based undercoat, let it dry then carry on with emulsion.

 

[Nestor_Kelebay]

So far as I know, nothing sticks to silicon caulk. In fact, even silicon caulk doesn't stick well to old silicon caulk.

If you're looking for a better caulk, then look for a synthetic rubber caulk sold under licence from the Koppers company of Australia called Kop-R-Lastic.

Kop-R-Lastic is a paintable synthetic rubber whose COhesive strength is even greater than it's ADhesive strength, which means it sticks to itself even better than it sticks to other things. And, that means that it stays on as well as any other caulk, but when you want to remove it, you just get one end started and it pulls off your window or door like a rubber rope. That's cuz it pulls off of whatever it's sticking to before it breaks. (co-hesive versus ad-hesive)

I own a 21 suite apartment block in Winnipeg, Manitoba, and I wouldn't use anything else on my 66 windows.

Contact your local window companies. The caulk they're using on their new window installations is an important decision to them, and you can be sure they're using the best stuff they can get from an installer's viewpoint. If they're not already using Kop-R-Lastic, then find out what they're using on their new installations. That'll probably be the best choice of what's available in your area.

Where I live, Kop-R-Lastic is what most window companies use. It makes maintaining window caulk easy because it makes removing the old caulk easy, if that makes any sense.

 

[confidentincompetent]

Hmm interesting stuff that kop r lastic nester. Problem is window installers over here use bog standard silicone stuff and it's a **** to get off. Some are sensible and use a paintable caulk inside. They are now using stufff that goes hard and it's worse when it eventually cracks. Anyhow as per my post I have found over the years if the bead of silicone is sound I rub a brush with solvent undercoat over. Not too thick or it will flake off just enough to stop emulsion cessing. Obviously if its loose, unsightly then I get the rest off ( takes ages )and go round with decorators caulk which is paintable and once painted will outlast silicone.

welcome to uk mate.

 

[Nestor_Kelebay]

Confidentincompetant:

My guess would be that the "undercoat" you're using isn't actually sticking to the silicon caulk, but merely forming a film over top of it.

If any paint would stick to silicon caulk, my guess would be that the manufacturers of that silicon caulk would immediately begin advertising that their products are "paintable". And, sadly, to my knowledge, the only paintable silicone caulks are the silicone modified acrylic caulks.

(and, I really don't have a clue what the words "silicone modified" on a tube of acrylic caulk actually are supposed to mean)

You might want to contact the U.S.E. Hickson Company and import a few tubes of Kop-R-Lastic from Canada and go into the business of supplying your local window companies with caulk. I assure you that they will be, quite simply, amazed. And, you will not be the first person in history to become wealthy through international trade.

http://www.usehickson.com/Koprlastic/ThermoplasticConstructionSealant/KopRLastic.shtml

And, Kop-R-Lastic is quickly becoming known throughout the world, as witnessed by this small building materials supplier in Latvia:

http://www.fabrika.ripo.lv/en/jumti_materiali.htm

Use the "Find" feature on your web browser to locate the word "Koprlastic" on their web site!

It's an excellent product and I've never lied to you before, have I?

Seriously, it'll cost you little to get some of it, and if it works as well for you as it does for me, it may be worth importing it for use on your own home.

 

[confidentincompetent]

nester wrote

My guess would be that the "undercoat" you're using isn't actually sticking to the silicon caulk, but merely forming a film over top of it.

Thats correct. But it suffices, maybe were not so fussy over here seriously though, I do this quite often and find when redecorating the same rooms for customers say 5/6 yrs later the emulsion is still there and I can just emulsion over same again. Hey u wanna buy some decent undercoat

It's an excellent product and I've never lied to you before, have I?

Seriously, it'll cost you little to get some of it, and if it works as well for you as it does for me, it may be worth importing it for use on your own home.

Thinks~~~~~~~~~~
Erm how many nigerian, canadadian euros will that cost me

 

[Zampa]

Heres a good one...silirub

http://www.absealantsltd.com/sealants.htm#Paintable Silicone

 

[confidentincompetent]

That looks good zampa, have you tried it ?

 

[Zampa]

That looks good zampa, have you tried it ?

Yes...tastes horrible!

There is another one on the market...the company who make it is a mans name...but I cant remember it...a customer mentioned it to me before, a paintable silicone..interesting.

But the fact that it can be toshed over is one thing...but what with?..in the situations that it would be found, around windows, doors etc we would probably be using an undercoat then a gloss but I dont think oil based unders would be suitable as it isnt as flexible as gloss...maybe a couple of coats of gloss is the answer?...water based gloss even?..thats more flexible than oil

Painting silicone is a bit like painting a balloon..the paint will stick but if theres a lot of movement it will lift over time im sure....depends how thick the bead of silicone is too

I just wish that carpenters, kitchen and bedrrom fitters and plumbers would stop thinking its the only thing you can squirt into a gap!!!!!!.....

Window fitters are slowly getting the message...

Worse case of 'silicone abuse' ive seen is a builder who fixed all the coving in a house with it!!!......then got the hump when I refused to paint the ceilings...

[/b]