Hi
Just a quick question, would love some advice on which is the better tent protection and waterproofing product to buy to do this, as I have seen many different types / brands and some seem cheap and some are expensive.
Thanks in advance
Phil
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It does entirely depend on the fabric the tent is made of. Polyester tents are given their waterproofing with a bonded PU layer on the inside, which gives it a shiny appearance. External treatments like Fabsil on the outside simply cause water to bead up and run off rather than soak into the outer layers. The advantage is that the tent will dry more quickly. If the inside PU layer is failing, you can usually see that it is peeling away and blistering. If that is the case then no amount of external proofing will stop it from leaking.
The main source of leakage on a polyester tent is the stitching on the seams as the threads do not close back around the stitches. This is why these tents have tape applied to the seams on the inside, to seal the stitch holes. Occasionally the tape may not cover the holes fully, or the water may wick down an inside tie or loop. If this is a source of leaking then you need silicone seam sealant applied inside to the leaking point, not exterior spray treatment.
Cotton canvas works very differently: the thread swells when wet to seal up the weave, making it waterproof, and the fabric closes in around stick holes so taping is not needed. Only in the most torrential weather where the fabric gets totally saturated would any damp come right through. Cotton and poly cotton tents need occasional proofing on the outside in order for water to bead up and run off.