For best results, we recommend using Seam Grip Sil from Gear Aid, thinned with oderless mineral spirits to a consistency similar to that of warm honey. Many have success using commonly available silicone caulks (also thinned with oderless mineral spirits), but there have been some reports of adhesion issues. If you go this route, please test for suitability on a small section first.
DO NOT USE sealers made for PU coated fabrics!
- It's usually easiest to seal your tent while it's pitched. For tarps, however, it may be difficult to reach the seam. In such a case, pull the seam taut over a flat surface, clamping it or weighing it down at each end to keep it in place while you work.
- Apply the silicone to both exposed stitches on the outside of the seam while also working some of the mixture under the fold of the seam. A glue brush works well for this (one is included with the Seam Grip Sil). We prefer to trim the bristles slightly to make them a tad stiffer.
- Wipe off excess (ie. drips, runs, or messes) with a paper towel, if necessary.
- Allow the silicone to cure.
- If your shelter has peaks designed to accommodate trekking pole handles, it’s a good idea to apply a second application to the seams around the peaks (or use a less diluted application) since these areas are subject to more stress.