mlthomas
Well-Known Member
I need to bond some wood to the GRP (making use over the very well bonded shaft drive) how/what would be the best adhesive/goop
thanks
thanks
Bond wood to GRP
- Thread starter mlthomas
- Start date
Avocet
Well-Known Member
I think we need a bit more detail please? Any chance of a photo of the area? A lot depends on how much load you'll need it to take.
Wood is pretty easy to bond to GRP anyway. First thing to do is grind away the top layer of fibreglass to get a good surface. If the inside of you hull (I assume it's the inside surface?!) has been "flowcoated", you might need to grind a fair bit off until you get down to fibres. After that, you'll need to offer your bit of wood up and profile it to the right shape to sit reasonably well against the abraded GRP surface. After that, it depends on a lot of factors what you do next. You could mix some epoxy resin and filleting blend up, "butter" the surface of your wood with it, and stick the two together, making a nice radius between the edges. That will make any fibre reinforcement much easier to persuade round the joint. Most glass reinforcements hate going round tight corners!
Once you've started with epoxy, you're pretty much committed to doing the rest of the job with it. If you don't want to, and the loads aren't high, you can use polyester resin and short, chopped glass fibres to do the same job, but it won't be as strong.
Wood is pretty easy to bond to GRP anyway. First thing to do is grind away the top layer of fibreglass to get a good surface. If the inside of you hull (I assume it's the inside surface?!) has been "flowcoated", you might need to grind a fair bit off until you get down to fibres. After that, you'll need to offer your bit of wood up and profile it to the right shape to sit reasonably well against the abraded GRP surface. After that, it depends on a lot of factors what you do next. You could mix some epoxy resin and filleting blend up, "butter" the surface of your wood with it, and stick the two together, making a nice radius between the edges. That will make any fibre reinforcement much easier to persuade round the joint. Most glass reinforcements hate going round tight corners!
Once you've started with epoxy, you're pretty much committed to doing the rest of the job with it. If you don't want to, and the loads aren't high, you can use polyester resin and short, chopped glass fibres to do the same job, but it won't be as strong.
oldsaltoz
Well-Known Member
Micro-fibres mixed with epoxy resin is a very strong glass to timber or timber to timber glue, just don't over clamp it.
gjgm
Well-Known Member
Yes, West Systems have the gear. Spread some neat mixed epoxy to seal the surfaces, then you mix the brown filler into the remaining resin to make a soft epoxy paste. Line that down the joint, and when the excess smears out under mild pressure, use a spatula to form a filet along the joint. If you need alot of strength you could then use that formed radius to support some epoxy soaked glass ribbon/tape.
West system are not the only co. , of course, but they do have all the various bits and pieces clearly labelled and very good instruction.
oldsaltoz
Well-Known Member
I suspect the "Brown stuff" you refer is in fact Micro balloons, not at all suitable in this application, it's used as a filler and for fairing.
Micro-fibres are white.
mlthomas
Well-Known Member
I'll make up the woodwork tonight, its not elaborate, just trying to make a flat wooden support surface that can be used, and some shallow supports which will be triangular in shape to compensate for the hull shape (fore to aft) which will straddle the expoxy part of the prop shaft.
Then I'll pop out to the boat tomorrow or Thursday and take a couple of pic's of where it is going which might help.
What I will end up with is two pieces of 12mm ply about 30cm long fixed lengthways onto the hull with a flat piece of ply across the the top which will give the horizontal surface.
If I'm breaking this out to get at the epoxy'd bit of the shaft I'm in a world of pain anyway which is why I am looking for such a permanent fixing.
Then I'll pop out to the boat tomorrow or Thursday and take a couple of pic's of where it is going which might help.
What I will end up with is two pieces of 12mm ply about 30cm long fixed lengthways onto the hull with a flat piece of ply across the the top which will give the horizontal surface.
If I'm breaking this out to get at the epoxy'd bit of the shaft I'm in a world of pain anyway which is why I am looking for such a permanent fixing.
Magaz97
Well-Known Member
BBC Bang program last night used melted ping pong balls and milk protein! Seemed pretty strong too
Phoenix of Hamble
Well-Known Member
Unlike the presenters!
mlthomas
Well-Known Member
As requested pics to help
Here is the space that I am planning to use
And here is what I am looking to bond
Here is the space that I am planning to use
And here is what I am looking to bond