i heard from someone the other day that when you lay down fibreglass you need to roll out the air bubbles and extra resin. the idea being that air bubbles weaken the fibreglass and that when you lay down a layer it will be laid even.
what say you?
Unwanted voids are the spawn of satan in composite products. Epoxy goes on with a roller, f’glass cloth/tape (or other cloths like Dynol) is worked with a squeegee.
Trying to get you a useful link, but it’s not playing nicely for some reason.
lets say you were using a piece of corrugated tin or plastic sheet as a mould
lest say the corrugated sheet was rolled into a tube and the fibreglass rolled over the outside or inside
ideally the outside surface should be even/ flat favouring the inside fibreglass layering and peeling the tin/plastic corrugated sheet outwards
its a little harder rolling it onto a corrugated sheet i guess
In boatbuilding, at least, a huge amount of work goes into preparing the surface which is to be coated – smoothing and fairing so that there are no unwanted lumps and bumps. That glass cloth has to go onto the substrate as cleanly and tightly as possible to avoid any likelihood of delamination. Before you try any laminating/composite, get youself a copy of Gougeon Brothers/WestSystem book, or go to a Boatcraft Pacific agent such as
Unit 1, 20A Bell St., South Townsville Qld 4810
or
172 Scott St., Cairns Qld 4870
and talk to them about epoxies and stuff. If you dive in and start splashing stuff around willy-nilly, it will probably end in tears.
For Dynol, read Dynel. Got two sheathing products mixed in my head for a moment there.Dynel and Xynol melded.
Not having a good night at all – Xynol*e*
Geoff D said:
Unwanted voids are the spawn of satan in composite products. Epoxy goes on with a roller, f’glass cloth/tape (or other cloths like Dynol) is worked with a squeegee.
Yep very cognizant and accurate.
I busy doin’ book lernin’ for when I finally get stuck into that little boat, roughbarked.
will look into it
Geoff D said:
I busy doin’ book lernin’ for when I finally get stuck into that little boat, roughbarked.
It is not disimilar to the skills learned at playschool for sticking paper to paper.
what say you?
Yes. It’s been a long, long time sob since I’ve every done any of this, but I used to build canoes and making sure all the air was out was something we made sure of.
roughbarked said:
Geoff D said:
I busy doin’ book lernin’ for when I finally get stuck into that little boat, roughbarked.
It is not disimilar to the skills learned at playschool for sticking paper to paper.
ofh the ironing.. I walked away to click the TV away from ads and got the mythbusters sailing on duct tape ;)
interesting factoid?
well you see when fibreglass cures where it meets the air it doesn’t actually cure properly because it is exposed to the air there
now when you mix the stuff up it draws in air, the air has a small amount of water in it. if it gets caught in the mix it affects the curing of the resin in a bubble inside the fibreglass and eventually starts peeling
f’glass cloth/tape (or other cloths like Dynol) is worked with a squeegee.
???????????
helped build boats
f-glass with resin mixed in was rolled
> f-glass with resin mixed in was rolled
That sounds like chopped mat, not biaxial cloth over plywood.
been flicking through a fibreglass book again
there are different types of weave and resin that can be applied. you might even build a fibreglass using a spool of twine like fibreglass.
wookiemeister said:
there are different types of weave and resin that can be applied. you might even build a fibreglass using a spool of twine like fibreglass.
Yep, woven, biaxial woven, chopped mat, strand …
i’d need to build a pretend childrens shed in the yard so its not considered a structure by council
those bastards want about a 1000 for the paperwork and signoff by someone, no wonder construction has ground to a halt over here
if you are fibreglassing you’ll need a clean area. something that looks like a tent on the outside could be another option