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Filler Material Question

Old 05-24-2019, 09:26 AM
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I am adding an aluminum backing plate for a kicker mount on a trophy 2002. There is a curve to the hull under the plate, leaving about 3/8 inch gap in the middle. I want to fill this space with a hard material to evenly transfer load. I don't care about adhesion since this will be bolted down. The plate will be roughly 18" x 11", so it will require a substantial amount of something. What should I use here?
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Old 05-24-2019, 01:18 PM
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West systems epoxy?
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Old 05-24-2019, 01:30 PM
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That was my first thought, but I figured it would be too thick to do in one pass? Ideally I want to put a bunch of it on the back wall, put the plate against it and bolt it down, squeezing the excess out the sides. Can I do that with epoxy/fillers without worrying about it cracking or anything? I have used epoxy a little bit, but I am definitely a rookie. And what filler would be best for this application?
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Old 05-24-2019, 01:42 PM
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Originally Posted by eblank View Post
That was my first thought, but I figured it would be too thick to do in one pass? Ideally I want to put a bunch of it on the back wall, put the plate against it and bolt it down, squeezing the excess out the sides. Can I do that with epoxy/fillers without worrying about it cracking or anything? I have used epoxy a little bit, but I am definitely a rookie. And what filler would be best for this application?
use woven roving. Wet it out and slap it on to however thick you need it. If you only use resin it may not hold up as well.
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Old 05-25-2019, 05:18 AM
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3/8" isnt too much but use the slowest speed hardner you can get. The plate itself will also act as a heat sink and doing it early in the morning before temps start climbing is a good idea too.

There are many ways to do it but the simplest is to mix up batches of epoxy and cabosil thickened to peanut butter consistency and glob it on roughly as thick as you think its needed or just a little more. Tape around the area first, coat the bolts with oil and wrap the plate with plastic. After globbing it on, mount the plate and tighten down, cleaning the squeeze as you go.

Once cured, pull bolts and remove the plate, tapping with a hammer to break loose if the plastic sticks (thicker film is better!). Then fill and voids with more epoxy/cabosil. Once cured, mount plate to your nee pad with sealant, done!
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Old 05-28-2019, 11:15 AM
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Originally Posted by eblank View Post
That was my first thought, but I figured it would be too thick to do in one pass? Ideally I want to put a bunch of it on the back wall, put the plate against it and bolt it down, squeezing the excess out the sides. Can I do that with epoxy/fillers without worrying about it cracking or anything? I have used epoxy a little bit, but I am definitely a rookie. And what filler would be best for this application?
Yes. but you will need to thicken it with cabosil. We used to "float " shaft struts in that way when aligning shafts. Works good.
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Old 05-29-2019, 09:53 AM
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Thanks for the detailed advice guys! Much appreciated. Hopefully I will get at it this weekend.
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