Actually the white spongy stuff used in packing, boogie boards and windsurf boom plugs etc., that has slippery feel and doesn't crumble, is Expanded Polyethylene
At least, that is what has been in my old windsurf gear.
(XPS) is the more rigid stuff, used for insulation board. It shapes ok but melts in polyester resin and epoxy doesn't always stick to it as well as other foams.
it also doesn't absorb water, is more rigid than other light core foams, and tends to break down if in contact with water for too long, especially in heating or freezing cycles. just fyi
The soft Polyethylene (PE) foam for plugs is a pretty good idea, but if you are anxious about it, maybe also a good idea to weigh your mast dry and reweigh it periodically.
If it gains weight, there is probably water in it, and you should take the plugs out!
merl wrote: ↑
Tue Mar 20, 2018 1:32 pm
jaros wrote: ↑
Sat Mar 17, 2018 11:33 am
I did the same with strips out of XPS. It keeps 99% of the water out, it adds almost zero weight and you can always get them out, rinse the inside of the strut with fresh water and put them back in.
I really can not see why they are not doing it...
I'd be interested to see some pics/vid of this mod if you have a chance!
This is also an interesting idea. Aside from labor/cost, one reason not do it is that one of the bad scenarios for corrosion is to have a small void or channel next to your alloy and fill it with salt water, and maybe some other contaminants. Eventually some customers would end up with metal filings, bits of sand, salt water etc pooling in there, wearing away any paint or anodizing inside, and causing unseen corrosion.