Delmanation repair help needed

Gjac wrote:

3 tons wrote:
3 M Spray aerosol contact cement may help...At auto body supply vendors.

77N has been around for a long time, and I have bonded many panels for aircraft with it. You need good pressure to make it bond well. Other things to be aware of, sometimes it is almost impossible to dry the delaminated area if you don't have access to a garage, and the only adhesive that will work in that case is a polyurethane like Elmer's or Gorilla glue. The moisture will cause it to react with the glue and foam out. I made a mess bonding mine back together because I could not get all the moisture out. Acetone in the delaminated area will remove some of the moisture as it evaporates. Ideally if you have a dry area and urethane foam, not Styrofoam as a substrate I would use a good epoxy adhesive from west marine or another boat place. Another thing to know the glass transition temperature(Tg), the temperature in which the resin will begin to soften is much higher for epoxies because they are a thermoset resin. If parked outside in the sun in the summer a contact adhesive will soften from the heat. If you go with a contact adhesive check the spec sheet and see what the Tg is. I have not checked surface temperature on a hot sunny day in AZ in a parking lot but it would not surprise me if it got to 160 F. Hope this helps.

larry cad wrote:

Gjac wrote:

3 tons wrote:
3 M Spray aerosol contact cement may help...At auto body supply vendors.

77N has been around for a long time, and I have bonded many panels for aircraft with it. You need good pressure to make it bond well. Other things to be aware of, sometimes it is almost impossible to dry the delaminated area if you don't have access to a garage, and the only adhesive that will work in that case is a polyurethane like Elmer's or Gorilla glue. The moisture will cause it to react with the glue and foam out. I made a mess bonding mine back together because I could not get all the moisture out. Acetone in the delaminated area will remove some of the moisture as it evaporates. Ideally if you have a dry area and urethane foam, not Styrofoam as a substrate I would use a good epoxy adhesive from west marine or another boat place. Another thing to know the glass transition temperature(Tg), the temperature in which the resin will begin to soften is much higher for epoxies because they are a thermoset resin. If parked outside in the sun in the summer a contact adhesive will soften from the heat. If you go with a contact adhesive check the spec sheet and see what the Tg is. I have not checked surface temperature on a hot sunny day in AZ in a parking lot but it would not surprise me if it got to 160 F. Hope this helps.

Certainly one of the best posts I've read on this forum in over 15 years. Well written and full of useful information.