Washington painters Rebecca Davenport and Ed McGowin, the only Americans to be offered restropectives at next summer's Tenth International Festival of Painting at Cagnessur-Mer in Southern France, are unlikely to participate. The reason: lack of funds.

The festival, which each five years invites previous prize winners back for small restrospective, last year gave awards to Davenport and McGowin. Not other Americans have won awards there.

Art consultant Anne Van Devanter and McGown's dealer, Barbara Fendrick, have tried, with small sucess, to raise the $28,000 that they say is needed to send both shows to France . "We do have conditional pledges of $3,500," said Fendrick. "We need the rest by March 15."

Of the $28,000 budgeted but not yet raised, more than $11,000 would go to Van Devanter and Fendrick for fess and expenses.

"Variousfederal agencies the Endownments, the State Department, USIA, do contribute to international exhibits," said Jack L. Boultan, acting director of the International Exhibitions Committee of the American Federation of Arts, which had endorsed but not contributedto the fund raising effor

The United States does help pay for American participation in the Venice and Sao Paulo biennials, but there are 30 such exhibits held around the world each year, and they don't support them all," said Boulton.

Fendrick said It, cost approximately $4,000 to send four paintings by teo painters to Cagnes-sur Mur last summer. Davenport and McGowin were to be represented by a dozen pictures each in next summer's shows, which Frendrick says will cost seven times as much. Contributions would be tax deductible, said Fendrick, who has approached corportions. "If the money doesn't come, I guess we just won't shows," said Davenport.