ISTWELD Waterproof Siliconised Acrylic Sealant Black 3 Pack, SOLVENT-FREE & ODORLESS Paintable Frame External Window Sealant for Filling Cracks and Gaps, Silicone Mastic

Great gap filler and sealant

This pack of 3 sealants comes in at around just less than £5 per tube which is pretty standard. I had never heard of this brand but was happy to put it to the test with some jobs that needed doing around the house.After cutting off the top and putting it in the gun type applicator, which isn’t included, it flows really well and quickly fills small gaps. It runs out consistently and is easy to manipulate.It drys well and I like that you can paint over it. I have used it on brick, PVC and metal and have had no issues, it works great every time.Really recommend this.

Poor quality, very messy, the worst filler I have ever used for worktops. Had to buy a different brand. As an experienced kitchen fitter I would not recommend!

CANOPUS ISTWELD Waterproof Siliconised Acrylic Sealant arrived in a box. It contains 3 tubes. Mine is in black.I appreciate that it is 100% solvent-free, odorless, and paintable.I utilised it to seal some brick gaps outdoors. In my case, black is less noticeable than the white one, so I did not have to paint it. It appears to be of good quality and waterproof.The tube fits well in the caulking gun.It is easy to squeeze and apply evenly due to its appropriate consistency.This sealant is highly useful and versatile. It would be suitable for various tasks, including filling frames, windows, cracks, gaps, etc.It is currently priced at around £5 per tube, which is quite reasonable.However, it has a relatively short BBD, end of January 2025.

Great value for money with a set of three BLACK siliconized sealant cartridges (for use with the manual gun type of applicators that you can get separately - not included in this bundle of three tubes). Cut off the top and then inject it into the gaps as required. Can be overpainted as per instructions and ideal for filling gaps in windows and doors etc - but you cannot use it/install it when its raining apparently as per the instructions so best for use on a dry day and when its warm as if its a colder temperature it takes longer to cure. Instructions also say that once you've opened a cartridge you have to use it immediately so there could be some wastage involved if you only need a small amount.

Used this to reseal the acrylic windows in my parents greenhouse. It was easy to apply and worked a treat. Obviously you need the frame to use with these. Adhesion seemed good . Not sure how long the adhesion will last as the greenhouse is always in the sun but time will tell. Great value for money.

A very good bundle and super easy to use with a good thickness a durability. Ive applied on a warm dry day to give it time to dry and settle and to be fair impressive results which has aided a few disrepair window frames and door frames and has definitely helped with more then a few issues here.Easy to apply and to be fair delivers for high quality and value also perfect for multi purpose use.

So this seems to be pretty good quality sealant. Certainly as good as any well known brand I have used in the past. It flows from the tube well and with the nozzle cut at an appropriate angle it is easy enough to get a smooth bead.One tube did leak from the bottom. Looked like a manufacturing defect but I was still able to make use of the sealant so I was not that put out by it.The sealant does not go off completely. It is elastic so it is good for joints that expand and contract.