[vettestr]

Make your own very easy to do. Wax a sheet of aluminum the size you need. A couple of times with a good car paint wax. Not as good as mold release but it will work fine. Be sure to let dry/out gas after buffing at least 1 hour before applying resin & mat.
Use a good resin ISO or Vynal Ester. Mix resin and paint with a brush= apply 1 or 2 oz mat and wet out with brush, = give it 1 to 2 min. to disolve glue on mat and then work all air out of area. = when cured or about 1 hour latter = repeat above until desired thickness... 1/8 thickness will take 2 or 2 applications of 2 oz mat. Final layer if you want a smooth surface should be cloth applied right on top of last mat layer and before it starts to cure.
Trim with an 1/8 metal cutoff wheel on a grinder to go through like butter. remove from alum. before cutting.
Sand between layers if more than 48 hours between coats. Use wax agent of finish resin on final layer if not covering with more glass