Today, I reinforced the hull with two more layers of fiber-glass in the center. The first one basically fills the section between the two strips of maple and the second one fill the section between the two strips of dark wenge. I did them one at a time in the same manner as the fiber-glassing I did yesterday. I allowed the first one to become tack-free before doing the second. While I was doing the first, I decided to do a fill coat on the primary layer of ‘glass that was showing around the perimeter. I used the same foam roller and then “tipped” it off with a dry foam brush (see video.)
This epoxy (MAS low viscosity with slow hardener) uses a 2:1 ratio which is easily controlled by using the calibrated pumps. You’ll notice in the video above that I pull up on the pump head before plunging it – this is to ensure that I get a full stroke.
In the time-lapse video above I am using a plastic squeegee to remove excess resin and also force the ‘glass down onto the previous layer. You want there to be enough resin to make the ‘glass look wet, but not glossy. Too much resin will “float” the ‘glass and will not provide a strong bond. Too little will “starve” the ‘glass and will be weaker and also take more epoxy later to fill the weave. Light pressure and a constant angle (about 70 degrees) from the surface will pull the excess resin out. If the ‘glass starts to look white, then it is “starved” and you should roll some more epoxy onto it and squeegee again. I’ve seen a tip to use a slit in a paper cup to run the squeegee through to remove the resin from it, but I didn’t have any cups, so I used a toilet paper roll taped at one end, instead. It worked great, but I am sure a paper cup would be easier.