PRC1422 but as I understand it:
Although used in amateur built fuel tanks, PRC1422 uses a dichromate hardener
and is NOT mil spec according to Leavens Aviation, the Canadian distributor.
PRC1440 uses a manganese dioxide based hardener and is the mil spec stuff for
fuel. This is the stuff that MAM lists as equivalent to what they ship. It is
more difficult to obtain (but the same price) where I am, and I'm not really
sure it matters, but given a choice it probably makes sense to stay with the
1440 in case it is more compatable. If anybody needs it, I will look up the
other equivalents as they are listed on the PRC sheets that MAM included with my
manual.
I couldn't obtain the 1440A brushable in a pint can but a 3.5 ounce Semkit (more
expensive) was about the right amount for brushing the rivets and seams of one
fuel tank. Or in my case, one Semkit before both tank tops were installed, and
one after the tops were installed.
Ken
PS - I wasn't near brave enough to consider testing with fuel before closing my
tanks. Nor did I feel the need to with fillets everywhere including around the
rivets. Like Warren I had no leaks. Well actually I had several leaks, but soapy
water traced them all to the various temporary plugs and balloons that were
installed for the air pressure test. Dish soap and water works much better than
laundry detergent.
"Warren T. Montgomery" wrote:
*-----------------------------------------------------------------------------------*I didn't pre-test prior to the top skin , however I did use PRC1422A,
brushable on all rivets and seams.
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