I used GE silicone and paint thinner, mixed 50/50 to seam seal my Tarptent Squall when new. Still looks great. The silnylon material collects more dirt by static than anything else. Just seems last year when I put the grid on my new Hilight, that the thinner didn't want to dry, even after a week, so I dusted it with foot powder which I have used on my other tent in the past as recommended by the seam sealer manufacturer. Some straight seam sealer might work also, not beaded up very high of course.