Tosh McCaber Posted June 28, 2021 Share Posted June 28, 2021 A wee question. I have small boxy (B&Q EPS) Depron fuselage broken mid- length to repair (grr- boohoo!) Fairly clean break. Should I use Epoxy for the joints, or would POR be strong enough? I was thinking internal reinforcement EPS sheet bonded with POR, and epoxy for butting the edges? Or could/should I just use POR for eveything- would it be strong enough for the butted edges? Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted June 28, 2021 Share Posted June 28, 2021 POR to butg join the parts, and then reinforcing inside with POR; or POR butt join and Gorilla tape inside (or out if you're not fussed about seeing it) Quote Link to comment Share on other sites More sharing options...
john davidson 1 Posted June 28, 2021 Share Posted June 28, 2021 Gorilla glue with a light dab of hot glue to hold it in place stopping the expansion opening the joint Quote Link to comment Share on other sites More sharing options...
perttime Posted June 28, 2021 Share Posted June 28, 2021 POR will do it all. The only thing with POR is that if you are using it as instructed (contact cement) you have zero working time: once the surfaces touch, that is where the parts stay. Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted June 28, 2021 Share Posted June 28, 2021 I rarely use POR as contact adhesive... just squish it on one part/the break, then tape it up temporarily or permamently Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted June 29, 2021 Share Posted June 29, 2021 I use UHU-POR much more as a contact adhesive these days and it is excellent in that role. In this case I'd be inclined to use POR as you describe and to fit an internal depron doubler over the repair and tape it up whilst it sets. The joint should be every bit as strong as the depron itself, provided there isn't too much compression damage to the depron. It was a very hefty arrival, so I'd be checking for that level of deformation -once the depron is creased and deformed it's structural integrity might be compromised and definitely worth fitting a doubler. The model flies superbly and can easily carry the little bot of extra weight that a doubler would add. Quote Link to comment Share on other sites More sharing options...
Tosh McCaber Posted June 29, 2021 Author Share Posted June 29, 2021 Thx again Leccy et al! looks like Depron will be the adhesive for the job! I'll let you know! Quote Link to comment Share on other sites More sharing options...
Tosh McCaber Posted July 29, 2021 Author Share Posted July 29, 2021 (edited) Used POR for reinforcement and butt joints. Thanks guys- All done, and ready to go. Looking as good as new! Edited July 29, 2021 by Tosh McCaber Quote Link to comment Share on other sites More sharing options...
sticky fingers Posted July 29, 2021 Share Posted July 29, 2021 On 28/06/2021 at 12:03, Tosh McCaber said: A wee question. I have small boxy (B&Q EPS) Depron fuselage broken mid- length to repair (grr- boohoo!) Fairly clean break. Should I use Epoxy for the joints, or would POR be strong enough? I was thinking internal reinforcement EPS sheet bonded with POR, and epoxy for butting the edges? Or could/should I just use POR for eveything- would it be strong enough for the butted edges? Quote Link to comment Share on other sites More sharing options...
Tosh McCaber Posted July 29, 2021 Author Share Posted July 29, 2021 Sticky- you seem to have put your entry in?? I just see my original question! Quote Link to comment Share on other sites More sharing options...
Nigel Heather Posted July 30, 2021 Share Posted July 30, 2021 I had a problem with a tip on my foamy acrowot breaking off. I tried gluing with POR but that didn’t hold for long. I then tried clear tape as well over the break and that was better. But my permanent solution was to push in a pin made with thin carbon fibre rod through the trailing edge. I did the same on the unbroken side for strength and balance. Nigel Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted July 30, 2021 Share Posted July 30, 2021 UHU POR dries but does not dry hard. This can be an advantage as you can usually pull a joint apart without damage even after a week. After a month or more the chances are joint is as strong as the Depron. On this basis I have found that a Depron 'field' repair is limited to low stress areas unless the joint can be securely taped over, preferably with a fabric reinforced tape. When time allows a local Depron doubler over the joint to be used then given a bit of time it be as strong as the original. For example 18 July 2018 after a cartwheel arrival! Right wing tip touched first. The following day. No reinforcement anywhere just an internal 2mm thick Depron doubler (same as the skin) over the flat area of the break with a bit of white paint to tidy it all up. It is still around 3 yeas later. Quote Link to comment Share on other sites More sharing options...
Tosh McCaber Posted July 30, 2021 Author Share Posted July 30, 2021 Vey good advice Simon! Quote Link to comment Share on other sites More sharing options...
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