Revere 45-AE4V, Service Manual

Page: 103 / 234

June 2/08
9101
7 - 7
3. APPLYING ADHESIVE
A. Combine the adhesive with the appropriate amount of accelerator and mix until uniform.
The catalyzed system has a pot life of 8 hours.
B. Both the tube fabric surface and the patch fabric, shall have three (3) coats of adhesive
applied with a stiff brush in such a manner that the adhesive is driven firmly into the fabric
weave.
C. Apply three (3) liberal coats of adhesive to the surface to be bonded allowing 5-10 minutes
drying time between coats. This will ensure a good basis for each successive coat, ensure a
good adhesive bond and prevent the seepage of air through the fabric.
D. For the purposes of repair the words ‘tacky’ and aggressive tack are defined as follows:
(1). When the word ‘tacky’ is used, it means that if the fingers are lightly dragged across
the adhesive, it tends to pull off the base fabric or the previous coat.
(2). When the words ‘aggressive tack’ are used, they mean that when applying light
pressure to the adhesive, it has bonded to the previous coats and tends to retain, or
stick to, the fingers.
E. Apply three (3) coats of adhesive to each mating surface, allowing the previous coats to
completely dry before applying the additional coats.
F. Fifteen minutes after the application of the third coat, when it has developed an aggressive
tack, swab one surface of the adhesive film with MEK.
G. Allow the excess solvent to “flash off” until tack (Approximately 15-30 seconds).
H. Join the surfaces and apply pressure with a hand roller. The tack, or open time, will depend
upon the thickness of the dry film and the quantity of solvent applied to the film for
reactivation. In any case, the tack time is very short and the bond must be made when
aggressively tacky.
I. If the third coat has dried it may be reactivated with a cloth dampened with MEK solvent.
Apply just enough solvent to recreate an aggressive tack on the surface. Reactivation may
be carried out up to two (2) hours after the application of the last coat of solution.
Note: If the solution becomes too dry between coats, or if any air bubbles are
not completely rolled out, or if the mating surfaces are dry, a ‘dry joint’
will result. The joint will appear sound, but it can be quite easily pulled
apart. When testing with a finger, the solution must show aggressive
tack, but no pick-up of solution. Rolling must be firm, working from the
center of the area toward the edges, expelling the air.