This past week has been busy. My one day per week part time job can consume too much time a couple times per year with Hazardous Waste training, physicals, respirator fit tests, writing semi-annual reports and so forth. But did get some "Glass" time in on Loretta.
I went and bought some "Door-Be-Gone" liquid to apply to the sides of the buggy where it had been cut. I have used the Door-Be-Gone before, twice, unfortunately, and it works very well. There is another brand out there that goes by "Door-No-More", but it is not available local to me and if you can only get it, it will work just fine for you.
DISCLAIMER The techniques I show on this post are in no way the only way to do this work, or the only materials that can be used. It is the way I do the task based on advice, instruction from some very good people in this club and on this site, experience in getting messy doing it, re-doing mine and others bad repairs, reading and general experimentation. My explanation and photo's are to show you this is actually easy to do, time consuming and messy, but easy.
First is to properly position the doors and hold them tightly and steady so once the fiberglass, (FG) and resin cures, it will be in the exact position you need it to be. On this buggy, I used 1 X 4 wood that was super straight. Wrapped it in wax paper so the FG would not stick to it. The used the existing holes to screw the wood to the body on the inside. Using the inside is important because it is the finished surface and is flat. This will hold the body and panel flat for a smooth final finish. If it was done from the outside, the roughness of the chopper gun sprayed FG may cause the interior to not be perfectly in line with one another.
This is where those small areas I did not grind away for FG prep come in handy. Since they are still original, They can be used to line up the top, but also the side edge.
Vince S. had told me it is best not to layer in over 4 layers of FG at a time. I cannot remember why, but once you lay 4 layers in, you need to stop to let cure so it does not get sloppy on the repair. 4 layers of the 2 ounce mat I am using builds up to around 1/4 inch thick. Next is to lay up the areas like you are tack welding in a piece of metal, and not cover the screw heads. (It makes it a LOT easier to remove the screws later!!!).
Note the screw I used to pry the panel slightly to help alignment of the panel. And the vice grip to hold the lower lip in line with the body lip.
It can be seen where I glassed in small pieces of FG between the screw heads.
Since I am cheap, I do not like to waste anything. Darlene calls me a pack rat and a David's wife calls me Sanford. So, I do not like to waste mixed resin. I try to use every bit I mix. It is not as cheap as it once was. So, when I get ready to lay up a area, I try to prep some other small areas in the event I mix too much resin, I can go to the small areas and "spend" the rest of the mixed material. It has to get fixed anyway. So, there were some big holes in the rear of the package trey and a few up front including the dimmer switch holes.
Some times I only get one of two layers on it, but it is there if I have extra later on another lay up session.
Now that the "tacking" in place of the panel has cured, the screws come out, the boards off, then the remaining areas ground for FG prep. Then lay in more layers to build up the repair from the knife edge to the top surface. Some times this takes a few applications to get it where you want it.
Other than the top area which cannot be accessed from underneath due to the "tubes", there is just a fine line to repair in the inside. This helps lessen the amount of finish body work needed on the inside. It will get ground out and about a 3/8 inch wide seam will get filled with resin mixed with Cabosil, (more on Cabosil later) for a smooth inner surface.
Repeat for the other side. Chris L. recommended to me not to try and do two large repairs at the same time. Focus on one, get it done, then go to the other. It will be easier on you and makes less mess.
I highly recommend having a "cutting" table where you can get away from the sticky repair and prep the materials for the lay up session. If you are dong a large repair like I am on Loretta, get some Acetone to help clean up the messy resin, off your hands, arm hair, tools, bench, dash, body and other areas it just gets on. If you are only doing small work, paint thinner will work, but will take a little more work to dissolve it away. Paper towels, ruler, scissors, mixing stick, gloves and other simple items.
I like to cut up the glass material and have ready for once the resin is mixed so it is just production when the time comes. A small stand to place some on is also handy.
And again, clamped and screwed into proper position and FG layed down.
Again, initial lay up cured, screws and boards removed and ready for grinding and additional lay up.
After a lay up cures, and before laying another layer on, I sand the cured areas. This not only gives a "fresh" surface to lay on removing wax and any contaminate, but also rough areas that stick up along the edges that will hold up a second layer from properly laying down flat.
Here you can see a low spot on the side edge. Do not be tempted to use body filler to take care of this. It is not a "Bondo Buggy", it is a Fiberglass Buggy, use additional fiberglass to fill the area.
Prepped and ready to lay in the next layer on the drivers side.
When the panels are prepped, remember they are ground on a taper from full thickness to a knife point edge. When it is layered back on, you start out with thin strips, then a little wide strip, then wider to reverse taper lay in the glass. Here is coming up on one of the final layers on the sides.
Wetting it in.
Basically the doors are done. They do need the very thin top worked to get it super close for primer, which will also be polyester Slick Sand. I like using "like" materials so all expansion/contraction during heating and cooling cycles is the same and reduces the chance of the repair shadowing under the paint.
The Door-Be-Gone has worked again.
Next up is the hood. For some areas, I use masking tape as my mold backing if the surface is flat, or very close to flat.
Here you can see how I cut the mat to lay up. Start out with the first layer almost the exact size of the hole to be filled, then slightly bigger, and again bigger. This is the reverse taper to fill the repair area evenly and have a consistent repair.
And laid in. What is not shown is some extensive repair up inside of the hood/dash meeting area on the sides of the hood. There was several holes drilled to mount the windshield, and all in the wrong position at the wrong angle.
Once the tape is removed, a nice repair is left with little final finish work needed to make it ready for paint.