Is it better to do all the layers at the same time, or is it better to let every layer dry before putting on the next one?

Let say I plan on doing 7 layers, do I do all 7 layers at once, or do the first one, let dry, do the second, let dry, and so on?

 

Nope..just put 1 on top of each other...

Why 7? if using 3 oz chop mat, you need 2-3 layers to achieve the strength of 3/4" MDF.

 

So I just keep on putting it on, and let it dry once every layers are on right?

I said 7 layers, cause I don't really know how strong fiberglas is

 

Which is stronger: Cloth or mat?

 

Matting, the one that looks all messy. The cloth is to give it a smoother finish. Also do it one layer at a time, with around 15 or so minutes in between to let it dry up.

Matting = strength
Cloth = Smooth Finish

 

Only 15 minutes so it's not all hard right. It still has to be somewhat humid right?

I'm asking cause I did, well tried, one project once and waited like 24 hours between layers. I ended up scratching the project and cut the whole thing. When cutting it appart, I could literally see the 2 layers. It was like if I took 2 fiberglass panel and glued them together.

 

depends on how the temps are during the time your glassing. Ontario gets humid during summers right? i would give it about 10-15minutes inbetween each layer just enough to get the hardener to get tacky so it will hold the next layer alot easier. If you aren't certain just touch the glass a little the hardener should feel like wet jelly that should be decent to put the glass on.

 

Aight... thanks

 

...Or, you could keep going and the resin would mix together and be even stronger...

Don't pause between layers at all. Use 3 oz CHOP MAT, never cloth.

 

good luck with the interior

 

Thanks... it's gonna be the trunk setup. My current setup weights a ton and a half. Time to put my ride on a diet. Weight watchers didn't want us in, so I gotta turn my back on them and work with fiberglass now

 

i was told in school when making molds or prototypes of anything you should allow the resin to get tacky then add the next layer...agreed 10-15minutes is long but its humid in ontario so the curing process will take a little bit longer. What you say is true but harder especially if you put two wet layers ontop of each other in a vertical position the second layer your putting on will bubble and will lift off from the first layer. Allowing the resin to get tacky will hold onto the second layer and will still allow the resins to mix.

 

Mat is equally strong in all directions.
Cloth is strong in one direction depending on how your cross your layers. Each one has it's own purpose depending on your applicaition and strength needed in certain spots

Here is used Cloth, small tight area to work glass around!



Here I used Mat on a sub box, uniform strength over larger area!!

 

Alright, here is how my project is coming along so far.

The structure of the box has been done, and the t-shirt has been layed as well. Now it's time to lay some fiberglass on that baby

 

is your back piece open to go inside and put mat in there? if it is, do that. Your outside shape is almost perfect! all you need to do is a little bondo before paint/vinyl and nothing if you're carpeting it. If you didn't leave the back side open, cut it up with a jig saw - you can seal it later with 'glass or bondo. Laying glass on the inside is always better, because like i said - it keeps your perfect shape.