For the past several decades worth of surfboards, somewhere around 50-60 or so, my daily drivers and semi's have been glassed with non-E glass. Started off with Warp cloth, then went to S (all modern S cloth is actually S2, as the original S cloth is a 30 year old mil-spec product) cloth, and have never looked back. For semi guns typical glass schedule would be 6 bottom, 4/6 top. For daily drivers, 4, 4/4 schedule. The cloth resin saturated during application, then squeegeed 'dry', which produces a lighter, stronger glass job due to the glass retaining more flex, as over saturated glass loses flex. S cloth is also much more dent resistant. During all that time, I have yet to snap a board, and buckled one board. I have a 24 year old 'magic' 8'0 semi, glassed with S 6,6/4, very light in hand, been on countless missions from Sf OB to Sunset to Indo to West Oz, has some dents, not a crease in it. After moving to Oregon 11 years ago, land of the punchy beachbreak, began moving up in board length to accommodate age and accumulated injuries, settling on two primary daily drivers - an 8'0 5 fin speed egg and a 9'0 5 fin HPLB, have owned several of each, all glassed in S cloth with 4 bottom, 4/4 tops. Not one of them has ever creased, and they have been subjected to all kinds of punishment. One of the 9'0s is now in the hands of a local charger who wins LB contests - he's broken 5 LB's in the past 2 years, uses the one I passed on primarily in the bigger waves he rides, and it's holding strong. Bert Burger of Sunnova surfboards, well known aussie composite board builder, did some tests with various cloths, and here's his report: tensile strength ; the test peices were stretched till breaking point,clamped securely at each end then continueously loaded with weight till breaking,a large bucket was loaded with bricks till the laminate strap broke..... e glass; 13 bricks s glass; 17 bricks carbon; 18 bricks "in flexural strength s glass was the surprise package ,with both glass samples they bent a little more each time weight was added till they finally broke,the s glass kept bending and bending along way before it broke" So point of all this? Consider having your lighter weight boards made out of S cloth, and don't be afraid to go light. Aside from logs, few shapes don't respond better when lighter rather then heavier. Cost increase is usually somewhere between $2 to $40 depending on board size. And if you prefer stronger, heavier boards, unless using Volan which is pretty much tank cloth, consider having your top deck layer S cloth - the board will end up with a whole lot less dents in it then having an E glass top layer. Want a bulletproof board? Do what the Rusty factory does with all it's team boards except for the small wave EPS/epoxy models - PU foam, epoxy resin, S cloth.