nick disjunkt
Adventurer
Hi all,
I don’t know if there are any fibreglassing experts on here but I have a question which I was hoping someone could answer.
The body on my truck is made with a steel frame, onto which plywood siding is glued, and the edges and corners protected with aluminium capping. The siding is made of roughly 3/4inch plywood with a thin layer of GRP (fibreglass) laminated onto either side. On the back corner, water has got under the aluminium capping and has rotted a section of the siding behind the GRP. #
It is unnecessary and too much work to replace the whole panel, and so I plan to cut out and replace the rotten section, about 20 inch x 10 inch. Below is my rough plan of action, using a simple half lap joint and an overlapping layer of fibreglass.
I could buy a small piece of the same laminated plywood, but getting the join to be seamless will be awkward, and I think that my plan is stronger as the fibreglass will tie the new to the old properly.
My question regards how deep I should leave the rebate to glass up to. I have some 280g twill weave and some heavy 600g biaxial cloth, I plan to use one layer of each. If I rebate too far, I am happy to fill up to the level of the old plywood with resin and filler, but it would be a waste of material and would take longer. If the fibreglass ends up being proud I’ll have to sand it down which is no fun at all.
How thick do you think that the two layers of cloth will come out at? I can of course just do a tester piece but I thought it worth asking the question here first. I’m guessing 5mm looks about right,
Many thanks,
Nick
I don’t know if there are any fibreglassing experts on here but I have a question which I was hoping someone could answer.
The body on my truck is made with a steel frame, onto which plywood siding is glued, and the edges and corners protected with aluminium capping. The siding is made of roughly 3/4inch plywood with a thin layer of GRP (fibreglass) laminated onto either side. On the back corner, water has got under the aluminium capping and has rotted a section of the siding behind the GRP. #
It is unnecessary and too much work to replace the whole panel, and so I plan to cut out and replace the rotten section, about 20 inch x 10 inch. Below is my rough plan of action, using a simple half lap joint and an overlapping layer of fibreglass.
I could buy a small piece of the same laminated plywood, but getting the join to be seamless will be awkward, and I think that my plan is stronger as the fibreglass will tie the new to the old properly.
My question regards how deep I should leave the rebate to glass up to. I have some 280g twill weave and some heavy 600g biaxial cloth, I plan to use one layer of each. If I rebate too far, I am happy to fill up to the level of the old plywood with resin and filler, but it would be a waste of material and would take longer. If the fibreglass ends up being proud I’ll have to sand it down which is no fun at all.
How thick do you think that the two layers of cloth will come out at? I can of course just do a tester piece but I thought it worth asking the question here first. I’m guessing 5mm looks about right,
Many thanks,
Nick