rparigoris
Joined: 24 Nov 2009
Posts: 804
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 Posted: Thu Jan 10, 2013 8:38 am Post subject: Filling/Painting Classic wings & Tail. SUPERFIL? SP106? |
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Hi Group
A couple of notes on filling with Expancel:
** I find that after wetting out the surface, I let my Aeropoxy cure until it's very very tacky, this way when you try applying the very very dry mix of Expancel, you can get it to stick instead of rolling off
** I find that you are better off mixing not too much Expancel at once, the heat from mixing kicks off the Aeropoxy quicker, helper or not I will weigh out Aeropoxy, just not mix it in several cups (I use between 8 and 16 oz paper cups), then mix up the Aeropoxy and keep on adding Expancel until it's as dry as bread dough, Nev taught me that if you get it dry enough it sands like Balsa, I never had much success getting it to stick without rolling off and sand like Balsa until I found the secret to letting the thin pure epoxy begin to cure and get very sticky
** Invariably you find yourself taking too long applying the very dry Expancel and it hardens a little and is very difficult to get it how you want it, two tricks both use heat, 1) heat up your spackle knife with a heat gun and it makes things slide very nice, often I will do this for final passes after you get what you want applied 2) You can add some heat from the heat gun to an area that is just plain being uncooperative
** Like many have mentioned if you don't fill enough, you get subsequent rings and batches that don't sand the same. There is a learning curve, but it takes a while before you convince yourself to fill it a lot more than you think you need to, then fill some more. Especially on difficult to sand compound curved areas, the "don't use any more spackle than you need to" mentality comes out, in areas like that, I will 75% fill with dry Expancel (but not quite as dry as when filling very large areas), then let the Expancel begin to cure a bit so it kinda holds it's shape, then give it a second pass fill after heating the first layer a little.
Ron P.
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