Mix the proper amount of resin needed and be accurate proportioning the resin and curing agent. Adding more curing agent than the recommended mix ratio will not promote a faster cure.  

Over saturation or starving the fiberglass or any composite fabric will yield poor mechanical performance.

Don't how much resin to use to go with the fiberglass?

A good rule of thumb is to maintain a minimum of 30 to 35%  resin content by weight, this is the optimum ratio used in

high performance prepreg (or pre-impregnated fabrics) typically used in aerospace and high performance structural application.

For general hand lay-ups, use 60% fabric weight to 40% resin weight as a safe factor.

Place the entire precut fiberglass to be used on a scale and determine the weight.

Typical fabric weights regardless of weave pattern

1 yard of 8 OSY fabric at 38 inches wide weighs 224 grams

1 yard of 10 OSY fabric at 38 inches wide weighs 280 grams

Ounces per square yard or OSY is also know as aerial weight which is the most common unit of measurement for composite fabrics.

If a scale is available, measuring by weight will insure better composite

fabrication and repeatability, rather than using OSY data.

To determine how much resin is needed to adequately impregnate the fiberglass, use the following equation:

(Total Weight of Fabric divided by 60%) X( 40%)= weight of mixed resin needed 

fw  = fabric weight

rc = target resin content

rn= resin needed

(fw/60%)x(.40%)= rn

(224 grams of dry fiberglass / 60%) X 40% = 149.3 grams of resin needed

 So for every square yard of 8 ounce fabric,

you will need 4.50 fluid ounces of mixed resin.

Common Factors Of 100% Solids (Zero volatiles and unfilled epoxy resin)

1 gallon of resin = 4239 grams (1.12 g/cc)

1 gallon = 128 fluid ounces

1 gallon of resin = 231 cubic inches

1 fluid ounce of resin = 33.17 grams

Apply the mixed resin unto the surface and then lay the fabric

and allow the resin to saturate through the fabric.

NOT THE OTHER WAY AROUND 

This is one of the most common processing error that yields sub-standard laminates.

By laying the fiberglass unto a film of resin, less air bubbles are entrapped during the wetting-out stage.

Air is pushed up and outwards instead of forcing the resin through the fabric which will entrap air bubbles.

This technique will displace air unhindered  and uniformly disperse through out  the fiberglass with minimal mechanical agitation or spreading.

LATENT CURING SYSTEMS

Latent epoxy resins are systems that are mixed together at room temperature and will begin polymerization but it will not achieve full cure unless it is exposed to a heat cure cycle. In general, these are high performance systems that demonstrate exceptional performance under extreme conditions such as high mechanical performance under heat and cryogenics temperatures, chemical resistance or any environment that epoxy room temperature system perform marginally or poorly.

  Upon the mixing of the resin and curing agent polymerization will begin and will only achieve partial cure. Some resins may appear cured or dry to the touch,  this state is called 'B-Stage Cure' ,but upon application of force will either be gummy or brittle almost glass-like and  will dissolve in most solvents. The semi-cured resin must be exposed to an elevated temperature for it to continue polymerization and achieve full cure. 

HEAT ACTIVATED CURING SYSTEMS

 This type of epoxy system will not polymerized unless it is exposed to the activation temperature of the curing agent which can be as low as 200F and as high as 400F. In most instances these epoxy system can be stored at room temperature and remain liquid for up to six months and longer