TM 1-1500-204-23-1 (h) Clean the abraded ceramic surface, including the fiberglass patch and the chipped or spalled surface, using a clean cloth moistened with methyl ethyl ketone,   TT-M-261.      To   obtain   satisfactory   adhesion, apply only to a clean dry surface, free of oil and grease. NOTE Do not use reclaimed solvents when preparing a surface for bonding. (i) Mix Pro-Seal sealant  according  to paragraph 9-23c(4). (i) Apply Sealant mixture to the ceramic surface, but first fill all spalled or chipped areas with sealant and spread flush with the ceramic surface. (k) Press     the     fiberglass     patch     (or patches) over the filled area to be repaired. (I) Attach  metal  clamps  or  weights  to the  patch  to  apply  contact  pressure  equal  to  about  five pounds per square Inch. (m) Place  pieces  of  1/8  Inch  fiberglass of 1/4 inch plywood pads under the clamps to distribute the clamping force. NOTE Do  not  use  rigid  pads,  as  these  will concentrate   the   clamping   force   on the  point  of  contact  and  may  crack the ceramic tile. Maintenance activities having the necessary equipment  may  use  the  vacuum  bag methods. (n) Cure  Pro-Seal  sealant  according  to paragraph 9-23c(5). (3) Repair    and    inspection    of    delaminated edges of backing.  Repair and inspection procedures are as follows: (a) Inspect   edges   of   the   backing   for delamination of the fiberglass layers. NOTE A  delamination  3  inches  or  less  in length  may  be  repaired.    No  repairs can   be   made   if   a   delamination   if longer  than  3  inches  or  if  panel  has more than one delamination. (b) Remove dirt and grease from the delaminated cavity before repairing as follows: 1 Inject methyl ethyl ketone (MEK) TT-M-261, into cavity with a syringe.  Let solution soak for a few minutes to loosen the dirt and grease. 2 Draw out the contaminated MEK with the syringe, or position the panel to allow the MEK to flow out by gravity.  Repeat the procedure until the cavity is clean. 3 Volatize    the    MEK    using    an electric hot air gun, or vacuum nozzle directed Into the cavity  Continue  procedure  for  10  to  15  minutes  Do  not use compressed air because oil and dirt in the air may contaminate the cavity. (c) Repair    delamination    of    fiberglass plies along the edges of the backing by filling the voids with epoxy resin using a DTA curing agent Mix 100 parts by  weight  of  EPON  828,  MIL-R-9300  (FSCM  36131) with 10 parts by weight of DTA O-D-1271 as follows: 1 Inject  the  resin  with  a  syringe until  the  cavity  is  filled,  then  brush  the  edge  surface smooth. 2 Attach    metal    clamps    to    the repaired area to rebond the fiberglass piles. 3 Place pieces of 1/8 inch fiberglass or 1/4 inch plywood pads under the clamps to distribute the clamping force. NOTE Do  not  use  rigid  pads,  as  these  will concentrate   the   clamping   force   on the  point  of  contact  and  may  crack the ceramic tile. (4) Repair and inspection of internal delamination     of     backing.          Repair     and     inspection procedures are as follows: 9-53