Thanks op I hope they have this in my local shop.

if you seal windows you need silicone ,,, if this is acrylic mastic which they usually are in £1 shop then its only for decorating. Hope this helps

This product is a silicone sealant...Googled it as says nothing on the tube..

Found it today among the cheap fillers and sealant,Milford Haven,had plenty in there.

Will check Ilkeston tomorrow if I remember thanks.

I think Unibond know what they're doing, don't you?

Nope, there are plenty of window sealants that are acrylic and they are rubbish. Peter is right it is best to check it's silicone. I learnt the hard way.

All brown in Ilkeston.

This is Silicon. It is a slow cure so should outlast the fast cure stuff. Takes a good 24-48 hours.

White in milford....I didn't check the others as it's white I wanted and was the first one I picked up.

yeah I expect they had a few before I finally got there, I had a good rummage but lucked out. excellent product, I have been using it to do all my windows.