yes both are CF posts and thanks I was going to use a polyester resin as we have it at work for flat roofing I’m sure it would be ok ? . I’ve roughed up the outside of the small seatpost ready for the over slip . Tape the end as you said . I’m not 2 concerned about the weight anyway , more the fact it was only my second ride on the bike after buying 😂 and not dumping a £1k bike
Desperate measures got me thinking