In a message dated 10/26/98 6:12:41 AM Eastern Standard Time,
[log in to unmask] writes:

> What is the downside of not using the primer on single window glazing, and
do
>  you have any suggestions on protecting or masking the glass surfaces. NP-1
>  appears to be a very tenacious product (unlike Dap-33 or putties which can
>  be remove fairly easily) which although it can be tooled (typical putty
knife
>  OK?), I don't think it can be worked like a putty.

After you apply the sealant you run a slicker over it. This is similar to the
round end of an old butter knife, which works just as well. Masking tape keeps
the edges straight. To remove the tape you have to pull it toward yourself and
slightly inward past the center line of the joint. It takes a bit of practice,
both to apply a proper amount of sealant and to cleanly remove the tape.
Someone skilled in using the caulking gun can run and slick it without a lot
of fuss. The hard part is not getting the sealant on yourself, the building,
or your upholstery. Don't leave the masking tape on for more than an evening,
it gets to be a real pain to clean off if left too long. The NP1 can be
cleaned off glass with a flat razor blade. It is best not to get it on
anything else that you want to keep clean. The next thing to deal with is two-
part adhesion, bond breakers, and depth of sealant to width of joint. After
that you can deal with structural sealants if you really feel inclined. None
of this is traditional, but it does represent current waterproofing
technology.

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