What type of fiberglass resin to repair interior door panel?
 

I attached a picture of my driver door panel interior. I've always thought it flexed a bit more than it should so I took it off and noticed that there is an area it's broken. I'm going to reinforce the entire panel with one or two layers of glass.

I found another thread where they repaired with fiberglass. I've done a lot of fiberglass work so it's no trouble.

I just need to know if it's an epoxy or polyester resin required. I want to get a proper bond and I know sometimes it has to be one or the other.

Does anybody know what works?

For future reference I decided to use epoxy resin based on the information below, and the fact that I already have a lot of it.

http://www.redrockstore.com/resin.htm

For anybody making a repair to the foam/fiberglass side of the door panel it would be a good idea to wipe the area clean with some rubbing alcohol. It's probably dusty and mine had some greasy stuff on it. Also scratch it a little bit with some coarse sandpaper to improve the bond.

Please post a pic of the repaired panel when done.

will do

A quicker fix is to use aluminum flashing, the very thin stuff but very strong in tensile stress. Sheet metal is very strong in tensile stress, most of the time you have to really pull the door close and not push it open. You can test this by grapping a piece of paper and pull each side NOT tear, kind of hard to rip...

You can even cut the stuff with a pair of sharp scissors, attach it with some short staples and hot glue. Also you don't have to worry about the resin dripping all over your panels, if it seeps through.

If you're going the resin route, use an epoxy. Epoxy will always give you a better mechanical bond than a polyester or vinylester. Also, depending on the type of foam used in the door panel, a polyester might actually react with the foam and eat it away. If you decide to use polyester resin, take a small chunk somewhere off the middle of the inside of the panel and see if it'll dissolve in a capful of catalysed resin.