epoxy over new stringers question
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epoxy over new stringers question

  1. #1
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    Default epoxy over new stringers question

    I am about ready to glass in one of my new stringers in my 21' daycruiser. The stringers are just over 16 ft. I am using 635 thin epoxy from us composites along with two layers of 1708 w/ no mat. I'm using LVL lumber (they will be covered by a floor) planed to about 1.5" - I have since rounded the top corners (after picture taken). I have a couple specific questions I'm hoping to get answers to. I've done small fiberglass projects but nothing like this scale.


    1. I am planning on putting a coat of resin on the stringer before I glass it. Assuming I have help, would it be better to wet out the 1708 on the floor first, then drape it over the wet stringer? Would this be possible to manage that long of a piece? Or would it be better to lay the cloth over it dry, then use squeege's/rollers to saturate it? And would it be better to have one guy on each end of the cloth and "drape" it over the entire stringer? Or should one guy slowly roll it over the stringer starting at one end while the other guy wets it out?


    2. Should I use separate pieces of glass to tab in the stringer where it butts up to the transom? Or should I just use the long piece of 1708 to curl around the transom at the ends (will it contour ok)?


    3. For the 2nd layer, is it ok to apply right after I'm done wetting out the first layer? Should I be concerned about working out bubbles etc with the first layer? Or wait until both layers are applied to really go at the bubbles? Will I have enough working time with the epoxy to do both layers at once?


    Also I'm using the slow hardner and will probably keep the garage cool (65 deg. or so) while I'm working on it, then crank up the heat while they cure. Any suggestions appreciated !

    Thanks
    Mike



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    Mike , some biaxials like #1708 ( are not recommended for use with Epoxy ) come with a layer of chopped mat ( csm ) that is either stitched or stuck on to one face - backside, and not to mention that 1708 is a very common biaxial . 17 is the weight in ounces of the two layers of glass and the 08 being a third layer of mat / csm unless you are using 1700 with a no chop back ........... that is a whole different ballgame when it comes to doing your layup or wetting your fabric out prior to layup because it can and often will distort making your layup somewhat difficult .
    Last edited by OFFSHORE GINGER; 10-24-2015 at 07:17 AM.

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    Mike , yes I would go with separate pieces of glass to tab in the stringer ( staggered ) where it butts up to the transom finishing everything off to hide all seams in your layup using 4OZ cheese cloth / finish fabric , and yes I would do your layup applying both layers of fabric ( staggered ) back to back making sure all air ( bubbles ) are rolled out prior to applying the next layer of fabric and once again might I suggest using 4 OZ cheese cloth / finish fabric to hide all seams because it makes everything look that much nicer . Mike , the answer to your last question is ..............................you will and should have more then enough time to do your layup seeing that you are using Epoxy / # 635 which gives you a far better chance of finishing one side at a time opposed to using Poly or Vinyl Ester Resins & not to mention no stank .

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    Ok great thanks for the advice. Sorry you are correct I am using the DB170 17 oz biaxial - no MAT from US Composites.

    The only thing I'm still wondering is if we should "drape" the stringer with the entire piece of fabric, then start wetting out from both ends (which I would think would be faster), or if it should be "rolled" on slowly from one end and wetted out as it is rolled. Is this just a matter of preference ?

    Thanks!

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    Quote Originally Posted by diamondracer View Post
    Ok great thanks for the advice. Sorry you are correct I am using the DB170 17 oz biaxial - no MAT from US Composites.

    The only thing I'm still wondering is if we should "drape" the stringer with the entire piece of fabric, then start wetting out from both ends (which I would think would be faster), or if it should be "rolled" on slowly from one end and wetted out as it is rolled. Is this just a matter of preference ?

    Thanks!
    Mike , personally I would drape the fabric over the entire stringer making sure it is just where it needs to be......... because once you start wetting out the fabric it will be very difficult to move without it distorting which is something I am sure you will soon find out and not to mention that I think you will find that it will be much easier ( manageable ) wetting out your fabric starting at one end and working your way to the other because it can and will get very sloppy at times , rolling out all air making sure everything is totally wetted out , trim if needed , apply second piece of fabric which should go much easier then the first ( hopefully )................... but that is your call because we all find are own way considering you have two stringers to do . Good luck and let us know how everything goes & if you like shoot me a P.M ( phone ) and I will be more then happy to answer any or all of your questions / concerns that you might have .

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    Thanks! That information is very helpful. I might shoot you over a PM when I get closer to go time. Got a bit of prep work left & am still waiting for fiberglass materials, and I have 3 small children.

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