Painting internal rendering repair advice needed

[Toddyboy]

Hi
Some background info of my fix/project

I have a single bricked garage with asbestos/fibre corregated roof that leaked.
After reading on here i got some Cromapol Acrylic Roof Coating, that sealed the roof (really impressed by this product)

Also is has quite a bit of condensation inside of the roof (another thing i need to sort, I was thinking about gluing some underlay to it) as money is soooo tight at the moment.

Anyhoo, i had cracks in the corner of the garage than ran from bottom to top, i think the walls had leaned out (if you get what i mean)
The old owners by the looks of it put a skim coat of render in there,when it was a small crack, the crack over the years has got larger.
Iv chisled out the old render and put in some new render, im going to brace the walls with 2-3 angled steel screwed in.
Then repaint the whole inside of the garage with B&Q maisonary paint

So really my question (s) is, how long untill i can paint over the new rendering.
And as I rendered 3 days ago and the weather has been really damp, how long should it take untill the render dries, as i can still leave a finger nail imprint in there?

Thanks in advance for any useful help.

Toddyboy

 

[conny]

Did you mix the new render to the correct ratio? Not sure but think it would probably be 4:1 ratio.

As you say, the weather is not exactly ideal conditions for helping to dry it out so maybe a little background heat is needed?

 

[Blagard]

<snipped>And as I rendered 3 days ago and the weather has been really damp, how long should it take untill the render dries, as i can still leave a finger nail imprint in there?

A cement based render would set overnight and by day 3 should not be able to take a nail imprint! There are two things that happen - The cement sets and then the render drys out. While setting (curing) is affected by temperature it should be OK after 3 days unless you had frost during the first day. If frost damaged you would have to do it again.

Normally I would suggest you leave the render until you know it is bone dry and this time of year that might be weeks especially if you get condensation on it or have it in a high humidity environment.

 

[Toddyboy]

Did you mix the new render to the correct ratio? Not sure but think it would probably be 4:1 ratio.

As you say, the weather is not exactly ideal conditions for helping to dry it out so maybe a little background heat is needed?

I used U-can Render repair mortar from B&Q to the instructions.
I'm not a great DIY'er

http://www.diy.com/nav/build/buildi...rtars/U-Can-Render-Repair-Mortar-5Kg-12047504

 

[Toddyboy]

<snipped>And as I rendered 3 days ago and the weather has been really damp, how long should it take untill the render dries, as i can still leave a finger nail imprint in there?

A cement based render would set overnight and by day 3 should not be able to take a nail imprint! There are two things that happen - The cement sets and then the render drys out. While setting (curing) is affected by temperature it should be OK after 3 days unless you had frost during the first day. If frost damaged you would have to do it again.

Normally I would suggest you leave the render until you know it is bone dry and this time of year that might be weeks especially if you get condensation on it or have it in a high humidity environment.

It was not a frosty day when i done it nor has been in the last 3 days.
I'll leave it till next weekend until i paint.
Should the repair be treated with anything before painting, ie pva or watered down 1st coat of maisonary paint?

thankyou both for your replies

 

[Blagard]

No further treatment required before painting - follow the instructions on the paint can in case a thinned coat is required

 

[Toddyboy]

No further treatment required before painting - follow the instructions on the paint can in case a thinned coat is required

Great, thanks again
Next job, tackling the condensation on the roof...another thread me thinks