how much the mixing ratio between fiberglass resin and filler ?

what I did

just for experience I lied the fiberglass in the board then I paint it with epoxy


(sorry I wasn't clear when I write "20% fiberglass" I meant fiberglass resin

is it right fiberglass resin mean= epoxy?


then I mixed 20% fiberglass resin with 80% filler

I am sorry for this mistake

 

Ok, that is clearer, you are using Epoxy - but once again you havnt told us what sort of 'filler' you are using. All of those materials mentioned by Teddy Diver can be fillers. What are you using?

Any cracking or shattering of filler depends on the type of filler. Wood Flour and sawdust tend to hold together better than say fine powdered fillers. But then, you dont get as fine , smooth finish with the wood products.

The easiest way to determine the suitability, is to mix a small batch to determine how it will set, and then perhaps 'test' it with a hammer or similar method.

Really, the only limit to the amount of filler is when it gets too dry from lack of liquid, and it stops mixing in the pot. How it stands up mechanically afterwards depends on what it is you use as the filler material.

 

what do you mean by using Wood Flour or sawdust


how?

 

Yaasaay, you clearly need to do some research, as your questions are of such a basic nature as to be nearly laughable at this point.

After 31 separate posts, you haven't gotten any further along the understanding trail, suggesting you are very young, very inexperienced and also unwilling to preform some basic searches.

Frankly, this is insulting and not worth the bother of hand holding a kid though the basics.

On the other hand if you show even the remotest endeavor to educate yourself, then these attempts to gain some knowledge and information here, would be fruitful instead of discourteous to those interesting in helping.

The first place to start is the Gougeon brother's book on boat building. It's an industry standard on epoxy use, though at this point I'm questioning if you even know what resin system you are using.



It can be purchased at the book store here or your favorite book seller. Yea, it's old fashioned to actually read and turn pages, get over it . . .

 

Believe it's also very much a language barrier. Also quite sure it's poly..

 

I will buy this book
also
If I Don’t Ask I Don’t Get


how do you want me to learn if I don't ask

 

Asking questions assumes you have some basic understanding of principles and techniques, both of which are easily obtainable. Asking for a dissertation on each process and not having a grasp on any part of these processes, is insulting and disrespectful. Simply put, you have a powerful tool here and elsewhere on the net, but you're not going to find what you need, without knowing what questions to ask. The only way to know what questions to ask, is to study the various subjects, develop a basic understanding of the concepts, principles and techniques, then formulate educated, knowledgeable, possably insightful questions about specific issues or problems you're encountering. That's when a place like this shines; in it's ability to offer advice, from multiple experience levels, to "dial in" your understanding.

 

Yaasaay, I think that PAR's tip on that book is a good one, you can find it (used, if you don't mind that) at Amazon.com for just $6: http://www.amazon.com/gp/offer-listing/0878121668/ref=dp_olp_used?ie=UTF8&condition=used
It will really help you a lots and save you a lots of money if you get some basic knowledge before proceeding further with your build.
Cheers

 

Yassay!
All my knowledge about epoxy comes from this forum and internet at the same time as I have studied sellers recomendations. But I have fooling around this forum for two years. And now I am building a small boat with ribbed wood and epoxy. The more you learn the easier it is to build.

I will also say it depends on wich grade you want to build and if you want it to look like a homemade boat or like a real proffesional building.

At the same time I have very much respect for Par and Daiquiri as they are proffesionals.
Their sugestions is always proffesional. And they never post rubbish.
If I would build a bigger boat in this way I would definately obay their sugestions about the book.

 

I am happy to explain.

It is exactly like making pancakes.

The dry 'filler' can be special fine plastic 'flour', or coarse sawdust that you get from sawing with a power saw, or fine 'wood flour', that you would get by using a belt sander on a bit of timber. It can also be specially ground hard material like concrete, for really hard wearing surfaces.

Each 'filler' is be suitable for different purposes.

Unlike pancake mix however, you combine the two parts of the resin ( epoxy and hardener) first, and mix them well with a stirring stick. You then start adding the 'filler' of choice, a little at a time, and keep stirring. This is oposite to adding milk and butter to a bowl of flour for pancakes.

Depending on your purpose, you will want to keep adding filler until you get to
1) Ketchup thickness ( usefull for joining two bits of wood )
2) Peanut Butter thickness ( it wont run down vertical surfaces)

the books that you read will not say what ratio to mix filler with, they will usually say what consistancy is required.

This is where the books become useful, as they will give you specific examples of where to use what thickness of mixture.

 

Hahahaha I just love the comparing to pancakes!
But yes this is a good explanation. hehe

 

I was just wondering yesterday about cheaper alternatives to all the various fillers and additives when I thought of regular old flour- has anyone actually tried it? How would it compare? Sure could save some cash!

 

Yes... regular flour has been used, along with baby powder, powdered limestone and many other different fillers.

 

rwatson thanks for your explanation

I have really benefited

I am happy to see this receptiveness from you

Thanks