Epoxy resin can be found from 4.00 euro per KG up to 40 euro per KG , that is the aviation grade that will not even burn
In the example of sparohok for a 16000 lbs boat half that weight will be the
hull deck , bulkheads and furniture in the boat or 8000 lbs 40 % of this will be the resin used or 3200 LBS + 20 % wastage , we in fact use 1600 kg plus 10 % wastage = 1760 x 2.2 = 3872 LBS , that is 29040 USD , had we used polyester the cost for this resin would have been 5280 usd , with using epoxy other high tech materials come around the corner like Kevlar/carbon/Basalt fibre and unfortunately these materials all cost much more than glass
if glass is 1 for arguments sake than basalt is 4 , kevlar is 11 and carbon is 22
or in USD
4 usd per kg for glass
16 usd per kg for basalt
44 usd for kevlar and
88 usd for carbon fibre
also in these materials there are different qualitys
for carbon the difference between 3 k and 24 k is almost double in price if one can get it it is not only expensive but also hard to get.
Using all these materials does not only increase the cost of the materials but the
work is also more than using CSM ( chopped strand mat ) and hand lamination
we for instance resin infuse under vacuum every part of the boat built in composite material and the total time involved to built a
FastCat 435 is around 12000
If we look at the old St Francis , the same size cat or the maxim 39 also abou the same size but both built in wet lay up and vacuum bagged , the maxim takes 4500 hours to build and the st francis around 6000 hours another time consumer is the spray painting we do instead of using gell coat , the complete cat is spray painted in 4 layers of Awl grip
paint in order to save around 800 to 1000 kilo,s or 1700 to 2200 lbs.
It all costs but the result is a boat that weights half of what a comparable sized cat weights
11000 lbs for the
FastCat 435 , ( our aim is 10000 ) Payload 12000
24000 for the Admiral 40 and Knysna 44 or Payload 3800
20000 for the
Privilege 445 Payload 4000
23000 for the
Catana 431 Payload 3600
26000 for the Broadbleu 435 Payload 4000
all according to CE A
certification
About Mushy , that must have been a 1 euro per kilo type of epoxy and the mixture ratios where probably off
If epoxy is well mixed and post cured it is the hardest possible resin available , they make artificial tooths and limbs from epoxy
The Fokker 100 Aircraft is gleud together completely with epoxy gleu and the new 787 dream liner has a carbon epoxy fuselage and partial wing structure
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