Stage Twenty Two – Fibreglassing!!!
So now it comes to a stage I have been quite apprehensive about. It's obviously the final surface so I really don't want to stuff it up at this stage and although I'm comfortable enough with the epoxy now, I've never done any fibreglass lamination before. I was worried about how to actually wrap the box and what to do about joints in the cloth and corners etc. The main goal was to ensure that the joints in the box were wrapped properly as a lot of the boxes strength was coming from this.
So do I cut the cloth and tape the edges with say, a 50mm overlap and then infill the panels later or do I try and lay out large pieces of cloth and cover multiple panels in one go? Try and trim the cloth to do butt joints or just do lap joints and fair it later? I've been surfing a lot of wooden boat building sites (
http://www.woodworkforums.com/f32/) again and asked a few questions on what to do and got excellent answers that both processes would be fine. So I'm doing a mixture of both but mostly large pieces of cloth. Everyone recommended that the lamination be done horizontally so I'm rolling the box around the floor to do just this and it makes it easy to lay out the cloth too. Other advice was that any overlaps be top over bottom to ensure waterproofness in the rain. Campers that can't be rolled around the floor are usually wrapped around the bottom working up to the top so you get a 'weatherboard' effect.
I started with the camper upside down and did the floor first. This way, hopefully by the time I get to the top and door frames I will know a bit more what I'm doing and any stuff ups won't be seen. The fibreglass cloth does not wrap around the edges from the bottom panel as the side panels are going to do this. It does wrap around the front of the main door frame though.
The cloth was laid out dry and trimmed to a basic shape and the epoxy mixed up. I poured the epoxy on and spread it out with a squeegee and brush. I took a lot of care at this stage as I didn't want too much epoxy. Just enough to wet out the cloth and ensure it sticks well. Inside corners and joints are by far the hardest part to get right. After a few hours the epoxy is still tacky I did the second coat just using a foam roller. By contrast, this was really easy. When this was dry I trimmed the edges with a Stanley knife and feathered a 50mm edge by sanding for the overlap to come later.
Then I flipped the box on its side, taped off the 50mm overlap using masking tape and laminated the side panel the same way as before wrapping over the bottom panel. When the second coat was dry I trimmed along my tape edge with a Stanley knife and pulled off the excess. Excellent. This overlap was also feathered flat by sanding.
Then I flipped it again and did the other side.
Then the bottom of the overhangs was done the same way and then the back panel. This overlapped all the other panels except the top. I did this as these corners and edges will be forced into the wind and rain when driving down the road at 110kph.
Last of all I covered the top wrapping over the front, back and sides to create a nice “hat” for the camper. This took two pieces of cloth so there is a joint down the middle.
Oh yeah…I did the doors too.
All this took me quite some time because of the change in the weather. Those of you in Australia will know that the South East coast has been getting hammered by freezing cold southerly weather system and the temp has dropped to freezing and below. Record low daytime temps have followed to and this is not good for epoxy. I’m just working in a cold metal garage so it’s been taking 3 days to get the epoxy to set hard enough to sand so I can overlap the next layer. At least I could do second coat wet on wet after a few hours but it’s taken me 3 weeks from starting the floor to finishing the top!!!
So now I have to lightly sand the whole thing again and feather the overlap joints flat and will then I will roll 2 more thin coats of epoxy over everything to fill the weave properly and seal the whole box up. It’s important that I get the edges between outside of the door and the inside of the frame coated nicely to weatherproof it well. Then it’s time to paint!!!
But after all that I might clean up the workshop a bit first... :Wow1: