Have used before and works very well with my new berghaus brasher fellmasters like all nikwax products good value for the money and it does the job

If it works its up to 5 stars product works perfectly and great value excellent waterproofing spray would be easier its fairly expensive for what it is and the foam top is very flimsy cant see it lasting long but i guess you just need to squeeze the liquid out onto a small sponge and use that