By ezsailor - 1/13/2013 1:21:59 PM
Pleased to report that with helpful advice from your tech team and some forum members I have now successfully made up 6 flat c/f panels in 195 gsm varying from rectangular 400 x 400 mm to triangular 2200 x 450mm by resin infusion. All have eventually come out without voids (yipee), there was some scrap. They only worked well once I heated the layup table to 22c, and heated the resin as it flowed with a hot air gun. I did use a lot more resin than in your tables, but the surplus came off in the peel ply. My panels are 0.35mm thick.
Now can you you help me with sticking these on my grp boat? I have coarse sanded all the grp, 80 grit. I cannot control the temperature which is ambient in a big steel shed, currently 3c and 65% humididty. I therefore cannot use epoxy the glue them down, because any minor uneven heating / cooling causes ripples, I have tried. The surface is compound curve, just, but I have formed the panels dry, by heating them till flexible and taping them down to cool. (It works!) I favour using pu 18 adhesive as it is flexible and waterproof, but how on earth do I get an even thicknes of such a thick sticky adhesive over such a big area??? and how do I keep the panels even on top of the adhesive?? Any advice and or clues would be greatly appreciated.
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By Warren (Staff) - 1/25/2013 5:18:11 PM
Thanks for the photo, it has cleared up a potentially confusing situation!
Based on the information you have given, the temperature is your main issue, so you need an adhesive that will mostly cure in the time you are present (and hence can keep it heated). Our PU18 Black Flexible Polyurethane Adhesive would work nicely in that sense. It can be spread using a spreader and will "skin" in approximately 70 minutes (once a skin has formed, in essence the outside of the blob of glue has cured, you'd need to remove that skin if you had left a piece too long).
That would give you a decent working time to align a panel and put it into place. I would recommend weighing it down to help it stay in place. If you still have issues then try vacuuming the panel in place.
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