Cracks in exterior render

[-Paul-]

Hi
My parents in laws house has some cracks in the exterior render which I wanted to patch up and touch up with paint. See the two cracks below (on the second closeup picture it makes the crack look quite wide but they are only one to two mm wide).

Can I just use an exterior caulk like this https://www.screwfix.com/p/no-nonsense-exterior-decorators-caulk-white-310ml/9735h ?

Thank you for your help

Side of window

Side of window closeup

Above window

 

[opps]

Image 1&2 (and possibly 3), I'd use a MS polymer, eg, Stixall, CT1, Sixaflex. You need to apply waterbased paints over them before you can apply oil based paints. They are almost as flexible as silicone sealants but have the added advantage of being paintable.

In image number 3, once you use the MS polymer, after the first coat of paint, you may want to throw some sand at the first coat of paint to hide the new smooth line.

A tube will cost £5 to 10 but they are very sticky, I'd recommend buy some decorators' wipes to clean your fingers after (price £5 to 10).

Standard caulk will shrink back and is more likely to crack again. It may suffice but do you want to risk having to do the job twice.

If, for whatever reason, you don't want to use a MS polymer, Toupret make a caulk with fibres to resist cracking (Fibracryl- approx £8), it will shrink though.

 

[-Paul-]

Thank you for the detailed reply.

Think I'll go with the stixall if they are all similar as it is the cheapest. https://www.amazon.co.uk/Stixall-Ex...=Stixall&qid=1567440465&s=gateway&sr=8-2&th=1

I presume it's ok to smooth the line it with a finger and washing up liquid/water as long as any washing up liquid is wiped away and it is dry before painting.

Thanks for the sand tip.