You got an opnion when I said, ‘‘Yes, its strong enough for a short life, ultra light, pro type shortboard’’. That is an opinion, and its clarified within a context. If you were asking for it to be clarified within a different context, of say a longer life longboard, then you should have specified as such, at which time, I would have said absolutely not.
Not sure how you can say this, when the weight of Innegra was not specified. It comes in 2oz, so in theory 2oz e glass, 2oz, innegra, 2oz e glass…might not be overkill.
grasshopper wrote:
2 layers will have a higher strength to weight ratio as there is less open space between the weave and less fiber distortion as the warp and weft go over each other. Also it will take less ‘fill’ resin to cover the weave pattern for sanding. In your build I would put 2 Oz on both sides of the innegra.
This is close to my logic as well. I have a semi-stringerless XPS build coming up where I plan to use 2-6-2 for both sides. IMO I will get better bonding to XPS with 2 oz because of the increased surface area afforded by smaller diameter and higher fiber count weave. The first 2 oz lamination should not need a lot of resin to get good saturation. Because of the 2 oz base, less resin should be needed for the 6 oz lamination. The last 2 oz layer will give me the final glass strength wanted – that lamination should not be much more than a fill coat for the 6 oz layer.
I guess I will find out.
@ anhauseer. I agree with most that your 2 + 2 layup is not likely to give you a lot of extra strength and with McD that laminating 3 layers of cloth is extra work. I have not worked with Inegra. But if it soaks up a lot of resin, you are not getting any weight advantage…
So what weight are you shooting for, ahausheer?
That’s not fiber that give adhésion but resin. That was main problem in mold wood composit for boat, with fluid long cure époxy and pressure all epoxy seep in wood let too thin glue between veneer for real gluing, now they use thickened résin. The key for gluing with résin is to have enough résin to glue and go have enough flexibility for this résin, that’s way structural époxy glue have charge that increase viscosity and flexibility without too much lost of wet ability. For lam on xps, sand with coarse grit sqeege mid flexiblity, if possible, epoxy then lay fiber and lam.
Good point. While the fiber surface is greater, the foam surface area has not changed and the resin is between the two.
But the main reason I am using the 2 oz FG is not for increased surface area.
Some seem to be concerned about adhesion/bonding. Innegra to foam, delam etc. my question would be; When’s the last time you saw an Innegra to foam Delam??
Or better yet. When’s the last time (if ever) you’ve seen Innegra ??
As I said earlier, I have never used Innegra. Never will.
I have been commenting about 2 oz FG.
I have tried laminating 0.58 oz volan…
Questions were not directed at anyone in specific. Meant for the general poster or posters contributing to the thread.
Lots of good and correct input form contributors here.
There seems to be two topics.
The 2 layer of 2oz Fiberglass vs single layer of 4oz Fiberglass and the other topic of Innegra.
Regarding the 2 layers of 2oz Fiberglass vs the single 4oz Fiberglass.
There is a simple answer regarding the differnce in strengtht… Fiberglass weight is never what is printed on the box or what it is refered to as. Manufacturers round up or down. With that, all 4oz surf fiberglass is really not 4oz. They actaully range from 3.64 -3.68 oz. (This covers BGF/ Aerialite , JPS and Hexcel). “Can I get a bolt of 4oz” has become easier for most than “Can I get a bolt of 3.67 oz”.
Most 2oz glass suitable for a surfboard application is not truly 2oz. It tends to be 2.38oz. So the two layers of this will actually equal 4.76 oz vs a single layer of “4oz” which is actually at best 3.68 oz…
Simple put, the result of 2 x “2oz” is stronger. than 1 x “4oz” becasue there is more glass in the final lamination.
Mc Ding the adhésion problem can come from poor résin adhésion to plastic fiber. I have see it with PE fiber (dynema) and kevlar. Innegra is pp wich is like PE, near impossible to glue. On their website they show test adhésion with resins to choose good ones. Like you i don’t think it’s main problem for our use.
Chris-- can you take a shot at the other thread titled “Innegra”. About four or five threads down from this one. Much appreciated. Lowel
Everyone that has glassed a surfboard using 2oz or 3 oz cloth please remain seated… all others take a hike. I’m calling Bullshit on all the talk…suto experts. Kung fu fighters with no kick.
I have hand laminated with 2oz and 3oz cloth. It sucks to work with. It is not for surfboards or hand lam. Regardless of studies someone has to glass the surf board… I want to paddle out through the channel and score a set wave… not get pounded by the shore break…
4oz and 6 oz E cloth for me… How many boards has the OP glassed?
Used 2 oz with compsands. It is harder to work with, moves around a lot and harder to squeegee. You need a light touch.
We would use a layer of 2 oz under the balsa skin. Even though we just needed to wet out the glass, it was pretty easy to mess it up. The vacuum bag pulled out the excess resin so we didn’t have to do that with a squeegee.
Do you know anything about the members you make claims about Dingray?
I am calling you out on your “suto” (pseudo) knowledge about members you have never met or worked with. Can you back up your statements with facts? Or are you just “talking?”
Hand laminating 0.58-oz FG with a squeegee was a b!tch. Bunched up like tissue paper. But I am guessing it must be easy compared to your experiences with 2-oz and 3-oz FG. Maybe there is another way to “hand laminate” lighter FG with and/or without a squeegee. Have you tried one? Or is there only one way? I will let you figure that out for yourself.
BTW I love the Dingray splint method for repairing broken surfboards. So original…
You are right Shark Country. Use in composite and under veneer is the most common. Some guys use it in ding repair primarily over cracks, buckles etc. to keep them watertight.
Ive done the same 2oz innegra 2oz s cloth and works great its a bit soft on a eps blank, i use epoxy on a urithane blank for that reason and it works as well as 2 x 6oz poly res job.
Wont last forever but its definitely up to task
If you want no heal marks 2oz s 2oz inegra 4oz s make sure you use epoxy the poly isnt up to the task of the structural strength of those fibers
… stingrrraay, come on.
Easy now big fella.
